| Section | Date | Issue | Size | Title | |
| Vol. 1, No. 1 | 1925-09-01 | 2.20 MB | ▪ The Model Shop ▪ The Semi-Remote Control Power Board ▪ Mathematical Research | ||
| Vol. 1, No. 2 | 1925-10-01 | 1.46 MB | ▪ Electrical Stethoscope ▪ The Spinal Cord of a Nation ▪ Analysing the Motion of Mechanical Devices ▪ The Artificial Line ▪ Who Pays Our Salaries? ▪ Modern Economies Replace Historic Power Plant ▪ When the Alarm Rings ▪ Storage "B" Battery Truck | ||
| Vol. 1, No. 3 | 1925-11-01 | 1.46 MB | ▪ Our New Building ▪ History of the Telephone Pioneers of America ▪ Sound Recording and Reproducing ▪ Six Thousand Lettres a Day ▪ Keeping Time at West Street ▪ The New York-Azores Cable ▪ Telephone Dictation | ||
| Vol. 1, No. 4 | 1925-12-01 | 1.63 MB | ▪ Our Historical Museum ▪ Multiplex Transmission by Carrier Currents ▪ Carrier-Current Telephone Systems ▪ For Better Radio Reception (548 Type Loud Speaker) ▪ Pressure Testing of Submarine Cables ▪ A Library of Heart Throbs | ||
| Vol. 1, No. 5 | 1926-01-01 | 1.26 MB | ▪ Carrier-Current Telegraphy ▪ Electro-Mechanical Sound Recording ▪ Mechanical Developments at Hawthorne ▪ Early Developments in Telephone Signalling | ||
| Vol. 1, No. 6 | 1926-02-01 | 2.14 MB | ▪ Transmission Limits of Telephone Lines ▪ Installing Radio Broadcast Equipment ▪ The First Woman Telephone Operator ▪ The Microscope as an Industrial Tool ▪ Telephone Signalling ▪ Water Cooling in Radio Broadcasting ▪ Stranded Conductor for High Frequency ▪ Apparatus Which Makes Air a Liquid ▪ Assembly Methods for Loading Coil Cases | ||
| Vol. 2, No. 1 | 1926-03-01 | 1.38 MB | ▪ Clear as Crystal ▪ Developments and Savings in Contact Materials ▪ The General Staff Department ▪ Why the Time-Clock Knobs Are Black | ||
| Vol. 2, No. 2 | 1926-04-01 | 1.80 MB | ▪ The Aurora ▪ Two-Way Transatlantic Radio Telephony ▪ Textiles for Insulation in Telephone Equipment ▪ Some Uses of the Cathod-Ray Oscillograph ▪ A One-Kilowatt Radio Transmitter for Broadcasting ▪ Development of Communication Systems ▪ The Systems Development Department ▪ How the Laboratories are Heated ▪ The Telephone and the Switching Locomotive | ||
| Vol. 2, No. 3 | 1926-05-01 | 1.99 MB | ▪ Power Equipment for Safeguarding Telephone Service ▪ Auditory Masking ▪ A Universal Laboratory Transmission-Measuring Set ▪ New Telegraph Equipment ▪ Lubrication and Wear ▪ The Development of Apparatus ▪ Printing Telegraph Connections With Hawthorne ▪ Cable Development Outpost at Hawthorne | ||
| Vol. 2, No. 4 | 1926-06-01 | 1.92 MB | ▪ The Manufacture of Vacuum Tubes ▪ Selecting an Audio-Frequency Amplifier ▪ The 6025-B Amplifier ▪ Methods of Measuring Children's Hearing ▪ Remote Control of Power Station ▪ New Portable Sets Measure Radio Transmission | ||
| Vol. 2, No. 5 | 1926-07-01 | 1.55 MB | ▪ Photoelectric Cells ▪ Making the Best Use of Experience ▪ New Cords and Cord Tips ▪ The Vitaphone ▪ An Audible Motion Picture ▪ Transforming Our Power Supply ▪ A Simplified Announcing System ▪ Speech Sounds | ||
| Vol. 2, No. 6 | 1926-08-01 | 1.56 MB | ▪ Cosmic Rays ▪ Planning a Radio-Telephone System ▪ In Tune or Out of Tune ▪ New Amplifier for Public Address Systems ▪ The First Underground Telephone | ||
| Vol. 3, No. 1 | 1926-09-01 | 1.34 MB | ▪ Four Years' Progress in Radio Broadcasting ▪ Telegraphy by Typewriter ▪ Odd Tools for Machine-Switching Apparatus ▪ Concealing the Wires ▪ The Ionization Manometer | ||
| Vol. 3, No. 2 | 1926-10-01 | 1.38 MB | ▪ The Evolution of the Input Transformer ▪ The Silent Drama of Telephony ▪ Our New Radio Laboratory at Whippany ▪ Public-Address Systems | ||
| Vol. 3, No. 3 | 1926-11-01 | 1.21 MB | ▪ Reducing the Cost of Electrons ▪ Mechanical Distribution of Toll Tickets ▪ A Mechanical Brain ▪ Saving by Swaging ▪ How the P.B.X. Gets Its Power ▪ A Modern Inquisition ▪ The Transmitter Life-Test | ||
| Vol. 3, No. 4 | 1926-12-01 | 1.64 MB | ▪ A Physical Background for Permalloy ▪ Dispatching Trains by Telephone ▪ When the Radio Squeals ▪ A Piano String Model of the Human Ear ▪ After Office Hours ▪ The Vitaphone Tells Tales of Itself | ||
| Vol. 3, No. 5 | 1927-01-01 | 1.18 MB | ▪ From Conference to Cable ▪ Accelerated Laboratory Tests ▪ Closing the Books ▪ Gauges for Machine-Switching Equipment ▪ Magnetic Materials ▪ Stroboscopic Analysis | ||
| Vol. 3, No. 6 | 1927-02-01 | 1.54 MB | ▪ Thermal Agitation of Electricity ▪ The Loudness of Pure Tones ▪ Power Supply for Radio Receivers ▪ Lead Cable Sheath ▪ Measuring to Four Parst in a Billion ▪ Phonograph Records Illustrating Distortion | ||
| Vol. 4, No. 1 | 1927-03-01 | 1.33 MB | ▪ The String Oscillograph in War and Peace ▪ A New Amplifier for Train Dispatching ▪ A Rectifier for Train Dispatching ▪ The Printed Form ▪ Electro-Mechanical Oscillators ▪ The Printed Form ▪ Electromechanical Oscillators | ||
| Vol. 4, No. 2 | 1927-04-01 | 1.36 MB | ▪ Are Electrons Waves? ▪ Marking the Overload Point ▪ Mechanical Filters ▪ An Announcing System for Battleships ▪ Cable Corrosion ▪ The Electrolytic Condenser ▪ Frequency Measurements with the Cathode Ray Oscillograph ▪ Measuring the Resistance of Sliding Contacts | ||
| Vol. 4, No. 3 | 1927-05-01 | 1.96 MB | ▪ The First Demonstration of Television ▪ Television by Radio ▪ Physical Principles and Apparatus ▪ Research and Development Leading to Television ▪ Television -- A Group Achievement | ||
| Vol. 4, No. 4 | 1927-06-01 | 1.76 MB | ▪ A New Type of Toll Switchboard ▪ Iron Crystals ▪ Long Waves or Short ▪ Light Finish in Central Offices ▪ Development of Light-Colored Finishes ▪ Eavesdropping on Bank Robbers ▪ Novel Devices for Lubrication ▪ Research Design | ||
| Vol. 4, No. 5 | 1927-07-01 | 1.16 MB | ▪ Insulation for Submarine Cables ▪ The Television Timer ▪ Wax Lubricants ▪ Quality Rating of Telephone Products ▪ Drafting of Telephone Systems ▪ A Direct-Reading Inductance Standard ▪ Flood-Time Telephone Service ▪ Cooling Our Drinking Water | ||
| Vol. 4, No. 6 | 1927-08-01 | 1.31 MB | ▪ The Hardening of Lead ▪ Measuring Dial Speeds ▪ Eleven Miles of Wire | ||
| Vol. 5, No. 1 | 1927-09-01 | 1.59 MB | ▪ A New Era in Loading ▪ New Step-by-Step Equipment ▪ The Life History of an Adsorbed Atom ▪ A Tour Through the Microscopic Laboratory ▪ Cutting Expense Corners in Systems Drafting | ||
| Vol. 5, No. 2 | 1927-10-01 | 1.70 MB | ▪ Hearing Aids and Deafness ▪ The Polarity of Learning ▪ A Compact Direct-Current Amplifier ▪ A Practical Short-Wave Oscillator ▪ Sheet Insulating Materials | ||
| Vol. 5, No. 3 | 1927-11-01 | 3.08 MB | ▪ Power Rating of Broadcasting Transmitters ▪ The Fifty-Kilowatt Radio Transmitter ▪ Working the Base Metals ▪ Echo Elimination in Transatlantic Service ▪ Polishing the Contacts of Telephone Plugs ▪ Saving the Tracing in the Systems Drafting Group ▪ Telephone Service Opened with Mexico | ||
| Vol. 5, No. 4 | 1927-12-01 | 1.49 MB | ▪ A Statement of Policy ▪ Fifty Years of Telephone Plugs ▪ Humidity Test Equipment ▪ Commercial Generator for Central Office Power Plants ▪ Cable Splicers' Test Set ▪ Strength-Tests of Telephone Materials | ||
| Vol. 5, No. 5 | 1928-01-01 | 1.42 MB | ▪ Twenty Years at West Street ▪ The Dufour Cathode-Ray Oscillograph ▪ A Brake for Rolling Ladders ▪ New Rubber Compression Testing Machine ▪ Saving Days and Dollars With Shears ▪ The 5-A Audiometer ▪ High Voltage Storage Battery | ||
| Vol. 5, No. 6 | 1928-02-01 | 1016.23 KB | ▪ Ionized Regions in the Atmosphere ▪ New Specifications for Raw Materials ▪ The Use of Codes in Electrical Communication ▪ Psychology Aids in Tests of Hearing ▪ New Languages from Old ▪ "What Are the Chances That…" ▪ Tooling-Up the Drafting Room ▪ The Twenty-Four Inch Cone | ||
| Vol. 6, No. 1 | 1928-03-01 | 3.06 MB | ▪ A New Loud-Speaking Receiver ▪ Step-by-Step Cordless "B" Board ▪ New Devices in Television ▪ Radio Installations in South America ▪ Water Cooling for Radio | ||
| Vol. 6, No. 2 | 1928-04-01 | 1.41 MB | ▪ "Signal Shaping" for Submarine Cables ▪ Platinum Alloys for Vacuum Tube Filaments ▪ Our Insurance Plan ▪ Carrier Telegraph in Canada ▪ The Local Circuit Development Laboratory ▪ Permalloy in Audio Transformers | ||
| Vol. 6, No. 3 | 1928-05-01 | 1.77 MB | ▪ The Decoder ▪ Differential Equations and Law ▪ Telephone Service Opened with Paris ▪ Phonograph Records of Heart Sounds ▪ Amplification Behind the Talking Movies ▪ Spectrographic Analysis ▪ The Laboratories Take to the Air ▪ Rotary File Type Information Desk ▪ Life Insurance Protection | ||
| Vol. 6, No. 4 | 1928-06-01 | 1.10 MB | ▪ Systematized Research ▪ New Standards in Emergency Power-Supply Units ▪ Sound-proof Rooms ▪ The Light of a Television Eye ▪ Amplifier for Condenser Transmitter ▪ Terminal Strips ▪ "To Have and To Hold" | ||
| Vol. 6, No. 5 | 1928-07-01 | 1.23 MB | ▪ Research Methods ▪ A Short-Haul Carrier System ▪ Determining Short-Wave Paths ▪ A New Non-Multiple P.B.X. ▪ Some Early Cable Terminals ▪ Very Thin Films of Rubidium | ||
| Vol. 6, No. 6 | 1928-08-01 | 1.44 MB | ▪ Some Facts about Frequency Measurement ▪ Continuous Charging for Automatic Branch Exchanges ▪ Acoustic Filters ▪ Apparatus Analysis ▪ Announcing the 740-A P.B.X. ▪ A New Method in Television ▪ The Opening of Transatlantic Service on Short Waves ▪ Taking the Harm Out of Harmonics ▪ An Efficient Driving Coil for Loud Speakers | ||
| Vol. 7, No. 1 | 1928-09-01 | 1.11 MB | ▪ The Perminvars, a Group of New Magnetic Alloys ▪ Hunting Features in the Panel System ▪ Cable Terminals ▪ The Grid-Current Modulator ▪ Insuring Central-Office Power Supply ▪ Frequency Control for Broadcasting ▪ The Rest Room in New Dress | ||
| Vol. 7, No. 2 | 1928-10-01 | 1.54 MB | ▪ Airways Communication Service ▪ The Nobel Laureates ▪ Human Errors and the Dial Telephone ▪ Critical Relays of the Telephone System ▪ Lever Type Keys | ||
| Vol. 7, No. 3 | 1928-11-01 | 2.18 MB | ▪ Reproducing Sound and Scene ▪ Fundamentals of Speech, Hearing and Music ▪ General Principles of Sound Recording ▪ Recent Advances in Wax Recording ▪ Sound Recording with the Light Valve ▪ Speed Control for the Sound-Picture System ▪ Sound Projector Systems for Motion-Picture Theaters ▪ Installation and Adjustment of Western Electric Sound-Projector Systems | ||
| Vol. 7, No. 4 | 1928-12-01 | 2.49 MB | ▪ "TU" Becomes "Decibel" ▪ Composite Telegraphy ▪ Panel Senders ▪ The Mechanical Delay-Network ▪ Development of the Impedance Bridge ▪ Coil Corrosion ▪ Trunk Hunting Switches ▪ Locating Faults on Toll Lines | ||
| Vol. 7, No. 5 | 1929-01-01 | 1.30 MB | ▪ Particles and Waves ▪ Transmission Regulating System for Toll Cables ▪ Corrosion of Lead Cable Sheath ▪ High-Strength Aluminum Alloys for Diaphragms ▪ Couteracting Dialing Errors in the Step-by-Step System ▪ Operators' Transmitters and Receivers | ||
| Vol. 7, No. 6 | 1929-02-01 | 2.01 MB | ▪ An Introduction to "Speech and Hearing" ▪ Development of the 1800-Pair Cable ▪ Private Branch Exchanges ▪ Atomic Physics and Circuit Theory ▪ Development of Step-by-Step Line Finders ▪ New Equipment for Voice-Frequency Telegraphy ▪ Ringing Machines for Small Offices | ||
| Vol. 7, No. 7 | 1929-03-01 | 1.60 MB | ▪ Leadership in Industrial Research ▪ Curious Patents in Mechanical Switching ▪ A New Telephone Door for the Retail Shop ▪ Saving Lead in Toll Offices ▪ Direct Scanning in Television ▪ Transmission Testing of Central-Office Circuits ▪ Small Power Plants for Telephone Repeaters ▪ Level Hunting Connectors | ||
| Vol. 7, No. 8 | 1929-04-01 | 1.22 MB | ▪ Textiles as Insulators ▪ Washed Textile Insulation for Central-Office Wiring ▪ Laying a Foundation for Aircraft Communication ▪ A New Radio Receiver for Commercial Airplanes ▪ Straightforward Trunking ▪ The Electromagnetic Oscillograph in the Circuit Laboratory ▪ A New Cordless Switchboard | ||
| Vol. 7, No. 9 | 1929-05-01 | 1.70 MB | ▪ What's a Good Loud Speaker? ▪ Extending the Usefulness of the Oscillograph in Circuit Testing ▪ Patents as a Means of Both Protection and Publication ▪ The Pulse Corrector ▪ Routine Tests in a Panel Office ▪ Graphical Symbols for Telephone and Telegraph Use ▪ Trouble Indicator | ||
| Vol. 7, No. 10 | 1929-06-01 | 1.46 MB | ▪ Picture Transmission in England ▪ Toll-Line Signalling ▪ Panel Fundamental Circuit ▪ All-Relay Register Circuit ▪ A Slide Rule for Vector Calculations ▪ Condensers for Many Uses | ||
| Vol. 7, No. 11 | 1929-07-01 | 1.79 MB | ▪ New Short-Wave Radio Stations ▪ Television in Colors ▪ Rotating the "Wax" for Sound Pictures ▪ A Carrier Telephone System for Power Lines ▪ Capability Engineering of Step-by-Step Relays | ||
| Vol. 7, No. 12 | 1929-08-01 | 2.51 MB | ▪ The Story of Short-Wave Transoceanic Telephony ▪ Transmitting Station at Lawrenceville, N.J. ▪ The Transatlantic Short-Wave Transmitters ▪ Short-Wave Transmitting Antennas ▪ The Transatlantic Short-Wave Receivers ▪ Short-Wave Receiving Antennas | ||
| Vol. 8, No. 1 | 1929-09-01 | 2.15 MB | ▪ Transatlantic Telephone Cable ▪ The Master Reference System for Telephone Transmission ▪ Voice-Frequency Equipment for the Transatlantic Radio Telephone ▪ Power Supply for Voice-Frequency Equipment, Transatlantic Short-Wave Radio ▪ The Commercial Problems in Engineering the Transoceanic Short-Wave Radio System ▪ Reproducing Machien for Picture and Sound ▪ Tie Lines Between Private Branch Exchanges ▪ A New Dial PBX of Large Capacity | ||
| Vol. 8, No. 2 | 1929-10-01 | 1.24 MB | ▪ High-Frequency Quartz-Crystal Oscillators ▪ Short-Wave Vacuum Tubes for Transoceanic Service ▪ Restoring Speech ▪ Bearings in Power-Driven Telephone Apparatus ▪ Methods of Handling Toll Calls ▪ Season-Cracking of Metals | ||
| Vol. 8, No. 3 | 1929-11-01 | 2.00 MB | ▪ Viscosity in Solids ▪ Permeameters for Measurements over Wide Temperature Ranges ▪ A New Multiple P.B.X. ▪ A Thousand-Ampere Choke Coil ▪ Calling Subscribers to the Telephone ▪ Standard Housings for Portable Test Sets ▪ Adjustment Provisions for Central Office Apparatus | ||
| Vol. 8, No. 4 | 1929-12-01 | 1.96 MB | ▪ Taking Chances in Inspection-by-Sampling ▪ A New Emergency Power Supply Unit ▪ Lacquering and Plating in the Laboratories ▪ Impedance Bridges ▪ Evolution of the Call-Indicator System ▪ An Outline of Step-by-Step Organization ▪ A Method for Estimating Audible Frequencies | ||
| Vol. 8, No. 5 | 1930-01-01 | 2.63 MB | ▪ Telephony Between Ship and Shore ▪ The Call Announcer ▪ Systems Drafting Moves ▪ Outside Plant Development New Quarters ▪ A Low-Insulation Alarm for Toll Cables ▪ Notes on Panel Development ▪ The Manual Tandem Board | ||
| Vol. 8, No. 6 | 1930-02-01 | 2.68 MB | ▪ New Sound-Picture Laboratory ▪ Testing Ringers and Dials at Subscribers' Stations ▪ Idle Trunk and Position Indicating ▪ The Telephone in its Infancy ▪ Economics of Relay Winding Design ▪ A New Dial PBX for Residences ▪ The New Chicago Toll Office | ||
| Vol. 8, No. 7 | 1930-03-01 | 1.99 MB | ▪ The Prior Art ▪ Prevention of Crosstalk in Phantom Loading Units ▪ Function of the Toll Circuit Laboratory ▪ Telephone Line Insulators ▪ Excellence in Auditoriums ▪ Improved Equipment for Information Service ▪ A New Timing Disc for the Oscillograph ▪ Bell System Contributors to the Encyclopaedia | ||
| Vol. 8, No. 8 | 1930-04-01 | 2.50 MB | ▪ A Year of Progress in Telephony ▪ Discontinuities in Magnetization ▪ Recording the Sound Picture ▪ Sound-Picture Slang ▪ A New Electrolysis Switch ▪ Clutches for the Panel System ▪ A Thousand-Cycle Frequency Standard ▪ New Equipment for Central Office Supervision ▪ Synthetic Photography | ||
| Vol. 8, No. 9 | 1930-05-01 | 3.31 MB | ▪ Two-Way Television ▪ Radio Engineering in Buenos Aires ▪ Subscriber's Line Finder and District Selector ▪ A Dial PBX for Large Residences ▪ The New Telephone Booth ▪ Shipping and Transportation ▪ A New Main Distributing Frame for Large Offices | ||
| Vol. 8, No. 10 | 1930-06-01 | 2.04 MB | ▪ Dials for the Flying Fleet ▪ A Cathode Ray Hysteresigraph ▪ Steel-Tape-Armored Toll Cable ▪ Die Castings ▪ Toll Tandem Switchboard ▪ Reduction of Noise in Cables by Electrolytic Condensers ▪ Short Cuts in Drafting | ||
| Vol. 8, No. 11 | 1930-07-01 | 2.48 MB | ▪ Improvements in Radio Broadcasting Transmitting ▪ Key-Display Type Call Indicators ▪ Automatic Prevention of Trouble by Decoders ▪ Flutter Effect in Loading Coils ▪ Multiplying the Subscriber's Line ▪ Acoustical Characteristics of Movie Screens ▪ Apparatus for Step-by-Step Routine Tests | ||
| Vol. 8, No. 12 | 1930-08-01 | 2.55 MB | ▪ Microphonic Action in Telephone Transmitters ▪ A Regenerative Telegraph Repeater ▪ The Ultra-Violet Microscope ▪ A Rapid Record Oscillograph ▪ Springs for Telephone Apparatus ▪ Central-Office Lighting ▪ The Holding Time Recorder ▪ The Campaign Against Noise | ||
| Vol. 9, No. 1 | 1930-09-01 | 2.53 MB | ▪ The Dean of Telephone Engineers ▪ Carty—The Engineer and The Man ▪ John J. Carty—a Biographical Note ▪ Radio Transmission to South America ▪ Measuring Flutter in Loading Coils ▪ Age Hardening Lead-Calcium Alloys | ||
| Vol. 9, No. 2 | 1930-10-01 | 2.68 MB | ▪ The Role of Barium in Vacuum Tubes ▪ Radio-Telephone Equipment for Airplanes ▪ New Radio Transmitters for Airway Applications ▪ Aircraft Radio Receivers ▪ Test Truck for Aircraft Radio ▪ Glow Discharge Lamps for Television System ▪ A Standard Test Set for Vacuum Tubes ▪ New Insulation Now in Production | ||
| Vol. 9, No. 3 | 1930-11-01 | 2.80 MB | ▪ Effect of Magnetic Interference on Relay Operation ▪ Automatic Display Call Indicator System ▪ A New Analyser of Speech and Music ▪ Reducing Wear at Base-Metal Contacts ▪ Panel Selectors ▪ Key Pulsing for No. 3 Toll Boards ▪ Function of Repeating Coils in Carrier Circuits | ||
| Vol. 9, No. 4 | 1930-12-01 | 2.38 MB | ▪ A New "B" Board for Panel Offices ▪ A Magnetization-Curve Tracer ▪ Cross-Fire Neutralization of Telegraph Circuits ▪ Finishes on the Metal Parts of Telephone Apparatus ▪ Power for Magneto Offices ▪ Common Frequency Broadcasting Development ▪ Ringing Conditions on PBX Trunks and Tie Lines | ||
| Vol. 9, No. 5 | 1931-01-01 | 2.23 MB | ▪ Telephone-Typewriter PBX Systems ▪ Selector-Connectors for PBX Service ▪ Economics of the Application of Relays to Telephone Circuits ▪ Electrical Delay Circuits for Radio Telephony ▪ Circuit Equipment for Program Transmission ▪ Step-by-Step Pulse Repeater ▪ A Shallow Horn for Theatre Use | ||
| Vol. 9, No. 6 | 1931-02-01 | 2.60 MB | ▪ Progress in Two-Way Television ▪ Early Manual Switchboard Development ▪ Telegraph Ground-Potential Compensator ▪ Testing Earth Anchors ▪ Telephone Jacks ▪ Telephone Order Wires for Toll Circuit Maintenance ▪ Maintenance of Tripping Relays | ||
| Vol. 9, No. 7 | 1931-03-01 | 2.35 MB | ▪ New Types of Photoelectric Cells ▪ Measuring Reverberation ▪ Life Testing of Vacuum Tubes ▪ A Small Call Indicator ▪ Damping Methods for Electrical Reproducers ▪ Theatre System for the Hard of Hearing ▪ Correct Time by Telephone | ||
| Vol. 9, No. 8 | 1931-04-01 | 2.65 MB | ▪ Sir Chandrasekhara Venkata Raman, Nobel Laureate ▪ Quality of Television Images ▪ A Trial of the Radiotelephone in Alaska ▪ Lamp Sockets ▪ More Phonograph Records Illustrating Distortion ▪ New Sound Reproducing Equipment for Theatres ▪ Washouts ▪ Saying it With Tones | ||
| Vol. 9, No. 9 | 1931-05-01 | 3.03 MB | ▪ An Address: Walter S. Gifford ▪ Key West-Havana Cable No. 4 ▪ Carrier Equipment for Key West-Havana Cable ▪ Paragutta ▪ A Wear Test for Finishes ▪ Acoustic Delay Circuits ▪ A Loud Speaker Good to Twelve Thousand Cycles ▪ A New Type of Laboratory Bench | ||
| Vol. 9, No. 10 | 1931-06-01 | 6.04 MB | ▪ Dielectric Properties of Matter ▪ A-C Busy Lamps for Toll Boards ▪ Molded Insulating Materials ▪ New Laboratories for Telegraph and Carrier Telephone Development ▪ Inductive Coordination Laboratory ▪ What the Sender Test Circuit Does ▪ A Universal Turret for Desk Mounting | ||
| Vol. 9, No. 11 | 1931-07-01 | 2.55 MB | ▪ Radio's Past and Future ▪ The High Vacuum Tube Comes Before the Supreme Court ▪ Welded Steel Cases for Loading Coils ▪ The Panel System ▪ Field Laboratory for Outside-Plant Studies ▪ Dielectric Properties and Chemical Constitution | ||
| Vol. 9, No. 12 | 1931-08-01 | 2.71 MB | ▪ Dial Offices for Small Communities ▪ Recording Contour Gauge ▪ A Linear Time Axis for a Cathode-Ray Oscillograph ▪ "—And the Operator Will Answer" ▪ Repeaters for Two-Wire Toll Circuits ▪ Measuring the Frequencies of Radio Signals ▪ Automatic Testing Equipment for Trunk Circuits | ||
| Vol. 10, No. 1 | 1931-09-01 | 3.95 MB | ▪ New Permalloys ▪ Four-Wire Telephone Circuits ▪ Non-Ferrous Alloys ▪ Profile Lathe for Miniature Work ▪ A Fruitful Application of Mathematics ▪ Radiator Cooling Units for Reserve Power Plants ▪ Highway Wiring Diagrams | ||
| Vol. 10, No. 2 | 1931-10-01 | 2.63 MB | ▪ Measuring One Trillionth of an Atmosphere ▪ The Single-Line Telegraph Repeater ▪ A Small Subscriber Set ▪ Telephone Apparatus for the Hard of Hearing ▪ Portable Speech-Input Equipment ▪ The Panel Bank ▪ Police of New York State Adopt the Teletypewriter | ||
| Vol. 10, No. 3 | 1931-11-01 | 1.74 MB | ▪ New Overseas Radio-Telephone Extensions ▪ A Versatile Nomogram for Circuit Problems ▪ Rolling Joints ▪ Interference Effects with Shared-Frequency Broadcasting ▪ Service Insurance for Toll Cord Circuits ▪ Shielding for Electric Circuits ▪ Squares and Rectangles ▪ The Golden Section | ||
| Vol. 10, No. 4 | 1931-12-01 | 1.71 MB | ▪ An Introduction to the Panel System ▪ A New Oscillator for Broadcast Frequencies ▪ Addressing Atlantic City Conventions ▪ The Sequence Switch ▪ Reduction of Radio Interference from Telephone Power Plants ▪ A 24,000 Watt Filter ▪ The Toll Train | ||
| Vol. 10, No. 5 | 1932-01-01 | 2.37 MB | ▪ The Time Factor in Telephone Transmission ▪ Nation-Wide Teletypewriter Service ▪ Coal for Transmitters ▪ An Adjustable Frequency Generator for the Voice Range ▪ Hydrogenized Iron of High Permeability ▪ Mortar Bandage Conduit Joints ▪ The Lapel Microphone ▪ Portable Balance Unit for A-C Precision Bridge | ||
| Vol. 10, No. 6 | 1932-02-01 | 2.47 MB | ▪ An Improved Transmitter for Operators' Use ▪ Distributing Programs in the Waldorf Astoria ▪ Quartz Crystal Resonators ▪ Coal Talks ▪ A Transmitter for the Coast Guard ▪ A New Retardation Coil for Composite Sets ▪ Power Driven Maintenance Tools ▪ Busy Indicators in the Manual System | ||
| Vol. 10, No. 7 | 1932-03-01 | 1.97 MB | ▪ Corrosion of Iron ▪ Printing the Test-Board Instructions ▪ Mechanically Locking Keys ▪ Switchboard Lamps ▪ Measuring the Illumination From Switchboard Lamps ▪ A Re-recording Machine for Sound Films ▪ Laboratory for Precision Linear Measurements ▪ Testing for Magnetic Characteristics | ||
| Vol. 10, No. 8 | 1932-04-01 | 2.23 MB | ▪ Pulp—The New Cable Insulation ▪ Smaller and Better Condensers ▪ The Mendham Laboratory ▪ A Push-Button Key for Train Dispatching ▪ Improved Continuity Test for Enamel Insulation on Wires ▪ The Horizontal Diamond-Shaped Antenna ▪ Transmission Networks and Their Measurement | ||
| Vol. 10, No. 9 | 1932-05-01 | 4.73 MB | ▪ Laboratory for Welding Studies ▪ Do Our Ears Grow Old? ▪ A Sensitive Moving-Coil Microphone of High Quality ▪ Adapting the Moving-Coil Microphone to Commercial Use ▪ Mountings, Connectors, and Amplifier for Moving-Coil Microphone ▪ The Service of Analytical Chemistry to Research ▪ A Portable Sound Meter | ||
| Vol. 10, No. 10 | 1932-06-01 | 1.79 MB | ▪ What is a Satisfactory Hearing Aid? ▪ Transmission Instruments for the New Audiophone ▪ Pacific Gas and Electric Extends Its Carrier System ▪ Transformer Equipment for Large Experimental Radio-Telephone Transmitter ▪ Audiphones ▪ Motion Pictures in Relief ▪ Acoustical Society Hears New Vertical Recordings | ||
| Vol. 10, No. 11 | 1932-07-01 | 1.56 MB | ▪ Electrical Reflections and Their Measurement ▪ A Low-Frequency Oscillator ▪ Summer Ailments and Their Treatment ▪ Portable Maintenance Tools for Commutators of Generators ▪ The Station Ringer ▪ A New System of Sound Recording ▪ A Measure of Physical Quality for Central Office Equipment ▪ Western Electric Photomatic Equipment | ||
| Vol. 10, No. 12 | 1932-08-01 | 1.83 MB | ▪ Boundary Lubrication ▪ A Permanent-Magnet Light Valve ▪ Portable Sound-Picture System for Sixteen Millimeter Film ▪ Wires for Subscribers' Premises ▪ Dial Services for Small Communities ▪ A New Switching Unit for Program Circuits | ||
| Vol. 11, No. 1 | 1932-09-01 | 2.15 MB | ▪ Order Turret No. 3 ▪ A Tone Alternator ▪ Proving Grounds for Telephone Poles ▪ A Splash-Proof Dial for the Navy ▪ Airport Radio Transmitter ▪ A Radio Transmitter for the Itinerant Flyer | ||
| Vol. 11, No. 2 | 1932-10-01 | 3.82 MB | ▪ Radiation-Cooled Power Tubes for Radio Transmitters ▪ A Low-Power Broadcast Transmitter ▪ Solder and the Art of Wiping Cable Splices ▪ Testing the Elasticity of Vacuum Tube Filaments ▪ A Crosstalk Measuring Set of Improved Precision | ||
| Vol. 11, No. 3 | 1932-11-01 | 2.28 MB | ▪ A Telephone System for Harbor Craft ▪ Forecasting the Behavior of Wood Preservatives ▪ Commercial Construction Adopted for Ringing-and-Coin-Control Generators ▪ Fishing Industry Adopts Marine Telephony ▪ The Development of the Protector Block ▪ Cellulose Acetate Treatment of Textile Insulation | ||
| Vol. 11, No. 4 | 1932-12-01 | 2.20 MB | ▪ A New Common-Battery Board for Small Offices ▪ Generating High Frequencies with Precision ▪ A Precise Radio-Frequency Generator ▪ A Skin-Effect Phenomenon ▪ A Frequency Monitoring Unit for Broadcast Stations ▪ Transmission Lines for Short-Wave Radio Systems | ||
| Vol. 11, No. 5 | 1933-01-01 | 2.23 MB | ▪ Evaluating Hearing Aids ▪ Music Wire Springs ▪ A Heterodyne Oscillator of Wide Frequency Range ▪ Combating Rust With Metallic Finishes ▪ Measuring Microphonic Noise in Vacuum Tubes ▪ Bus Announcing Outfits | ||
| Vol. 11, No. 6 | 1933-02-01 | 2.35 MB | ▪ A "Low-Hum" Vacuum Tube ▪ An Improved Wheatstone Bridge for Toll Test Boards ▪ Supplying Atmospheres of Known Humidity ▪ Light-Weight Transformers for Aircraft ▪ Portable Long Wave Testing Apparatus ▪ A Circuit for Measuring Longitudinal-Circuit Unbalance at High Frequencies | ||
| Vol. 11, No. 7 | 1933-03-01 | 2.06 MB | ▪ The Deformation of Matter ▪ Tuned-Transformer Coupling Circuits ▪ Mounting Quartz Plates ▪ A Radio Distribution System for Apartment Buildings ▪ A New P.B.X. for Large Establishments ▪ Power Equipment Laboratory | ||
| Vol. 11, No. 8 | 1933-04-01 | 2.22 MB | ▪ Measuring and Recording Low Humidities ▪ A Mercury Jig for Testing Toroidal Cores ▪ Experimental Paint and Varnish Compounding ▪ The New Oscillators for the Radio Frequency Range ▪ Loud Speakers Summon Physicians in the New York Hospital ▪ A New Service for Residents ▪ The Underwriters' Laboratories | ||
| Vol. 11, No. 9 | 1933-05-01 | 2.32 MB | ▪ The Reproduction of Orchestral Music in Auditory Perspective ▪ New Radio Telephone Equipment for Transport Airplanes ▪ A Three-Frequency Radio Telephone Transmitter for Airplanes ▪ A Crystal Control Superheterodyne Receiver ▪ Artificial Anthracite | ||
| Vol. 11, No. 10 | 1933-06-01 | 2.08 MB | ▪ An Acoustic Illusion Telephonically Achieved ▪ A Compression Test for Soft Solids ▪ Uses of Filters in Carrier Systems ▪ Mushrooms and Maintenance ▪ Delayed Speech ▪ Improved Current Control for Low Range Meter Calibration | ||
| Vol. 11, No. 11 | 1933-07-01 | 3.59 MB | ▪ The Panel Dial System ▪ A Stroboscope for Checking the Speed of Subscribers' Dials ▪ The Bell System Exhibit at the Century of Progress Exposition ▪ A Sensitive Method of Measuring Corrosion ▪ Soft Rubber Earpiece for the Audiphone ▪ Charging Batters Without a Generator | ||
| Vol. 11, No. 12 | 1933-08-01 | 2.73 MB | ▪ Harold de Forest Arnold ▪ Seeing Sound at the Chicago Exposition ▪ Radio Telephone Communication with the Caribbean Countries ▪ Voice Frequency Control Terminals for Caribbean Radio Systems ▪ The 13A—A Radio Receiver for Diversified Uses ▪ A Radio Transmitter for Central American Service | ||
| Vol. 12, No. 1 | 1933-09-01 | 2.42 MB | ▪ Filters in Action ▪ Direct Current Conduction in Dielectrics ▪ Water at West Street ▪ Gases in Metals ▪ A Current Transformer for Low Radio Frequencies ▪ Fuses | ||
| Vol. 12, No. 2 | 1933-10-01 | 4.20 MB | ▪ The Caesium-Oxygen-Silver Photelectric Cell ▪ Electrical Leakage Over Glass Surfaces ▪ Differential Pitch Sensitivity of the Ear ▪ Wetting of Solids by Liquids ▪ A One-Pair Loaded Emergency Cable ▪ Moisture-Proofing Transmitters with Rubber ▪ The 80A Amplifier | ||
| Vol. 12, No. 3 | 1933-11-01 | 1.74 MB | ▪ Ultra-Short-Wave Transmission ▪ X-Ray Examination for Metal Defects ▪ Measuring Inductance with a Resistor ▪ An Artificial Ear for Receiver Testing ▪ An Artificial Voice for Transmission Studies ▪ Amplifying Watch Sounds ▪ Evaluating Arc Resistance of Insulating Materials | ||
| Vol. 12, No. 4 | 1933-12-01 | 1.88 MB | ▪ A 100 Kilowatt Vacuum Tube ▪ Lubricating Brushes for M-Type Generators ▪ Weatherproofing of Telephone Wires ▪ Equalizers In Open-Wire Carrier Circuits ▪ Minimizing Modulation in Transformers ▪ Telephone Manufacturing Information | ||
| Vol. 12, No. 5 | 1934-01-01 | 1.88 MB | ▪ Permanent Magnets ▪ First Aid Kits and Facts ▪ Entrance Cables for Carrier Toll Circuits ▪ Distributing Toll Tickets by Pneumatic Tubes ▪ Moving the Toll Ticket ▪ Long Distance Telegraph Circuits | ||
| Vol. 12, No. 6 | 1934-02-01 | 1.41 MB | ▪ Open-Wire Program Circuits ▪ Line Filters for Open-Wire Program Circuits ▪ Resistance Lamps ▪ A Continuously Adjustable Band Pass Filter ▪ Testing the Life of Dial Apparatus By Machines ▪ A Self-Contained Bridge for Measuring Both Inductive and Capacitive Impedances ▪ A Mathematical Theory of Rational Inference | ||
| Vol. 12, No. 7 | 1934-03-01 | 3.26 MB | ▪ Auditory Perspective ▪ Auditorium Acoustics and Control Facilities for Reproductions in Auditory Perspective ▪ Loud Speakers and Microphone for Auditory Perspective ▪ Long Distance Transmission for Auditory Perspective ▪ Pounds of Prevention—Gas-Filled Cables ▪ Western Electric Noiseless Recording | ||
| Vol. 12, No. 8 | 1934-04-01 | 1.60 MB | ▪ Audio-Frequency Atmospherics ▪ How Sharply Can a Metal Part Be Bent? ▪ Regulation of Central-Office and Tie-Trunk Service in Private Branch Exchanges ▪ Reproduction of Pencil-on-Paper Drawings by Mechanical Means ▪ Surveying in Curbed Spaces ▪ Measurement of Transmission Loss Through Partition Walls ▪ The Oxidation of Organic Substances | ||
| Vol. 12, No. 9 | 1934-05-01 | 1.58 MB | ▪ New Airport Receivers ▪ A Highly Selective Weather and Beacon Radio Receiver for Airplane Use ▪ Remote Tuning Controls for Aircraft Radio Receivers ▪ Articulation Testing ▪ Automatic Articulation Testing Apparatus ▪ Adapting the Telephone Repeater to Train Dispatching ▪ Vitamin B | ||
| Vol. 12, No. 10 | 1934-06-01 | 1.62 MB | ▪ Feedback Amplifiers ▪ A Telephone for Use in Explosive Atmospheres ▪ Testing in Explosive Atmospheres ▪ The Direction of Arrival of Radio Waves ▪ Neutralizing Disturbance Voltages in Communication Circuits ▪ Winding Silica Springs | ||
| Vol. 12, No. 11 | 1934-07-01 | 1.91 MB | ▪ Early Handsets ▪ Joints in the Insulation of Submarine Cable ▪ Maintaining Quality in Bell System Dry Batteries ▪ No. 8 Test and Control Board ▪ Jacks and Plugs for Portable Telephones ▪ A 5000-Volt Mercury-Vapor Rectifier for the 6B Radio Broadcasting Transmitter | ||
| Vol. 12, No. 12 | 1934-08-01 | 1.39 MB | ▪ Trunking as a Problem of Probability ▪ Standardizing Basic Electrical Units ▪ Dissipation Constants in Solids ▪ Toll Transmission Measuring System for the No. 8 Test and Control Board ▪ The Electrical Constants of the Ground ▪ Retardation Coils for Precision Filters ▪ Adjusting Precision Filters | ||
| Vol. 13, No. 1 | 1934-09-01 | 1.84 MB | ▪ Speech Input Equipment for Radio Broadcasting ▪ Iron-Cobalt Alloys ▪ Testing Cable Sheath for Fatigue ▪ A Portable Oscilloscope ▪ The Trunk Group Busy Register ▪ The Switchboard Cord ▪ An Improved Bend Tester | ||
| Vol. 13, No. 2 | 1934-10-01 | 1.38 MB | ▪ An Extension of Land Telephone Lines by Ultra-Short Wave Radio ▪ Magnetic Materials ▪ Diffusion of Water Through Organic Insulating Materials ▪ The Regulation of Transmission Over Open-Wire Lines at Carrier Frequencies ▪ Acoustic Spectrometer | ||
| Vol. 13, No. 3 | 1934-11-01 | 2.15 MB | ▪ Some Principles of Transposing Open-Wire Lines ▪ The Nature of Water Adsorbed on Cellulose ▪ A High-Speed Level Recorder for Acoustic Measurements ▪ At the America's Cup Races ▪ Microanalysis ▪ Gas-Filled Thermionic Rectifiers | ||
| Vol. 13, No. 4 | 1934-12-01 | 1.95 MB | ▪ The Voice-Operated Compandor ▪ The Lineman's Leather Lifeline ▪ Spot Welding ▪ Observing the Corona ▪ The Holmdel Laboratory ▪ An Improved Volume Indicator | ||
| Vol. 13, No. 5 | 1935-01-01 | 2.17 MB | ▪ Loudness and Pitch ▪ High Frequency Resistance Standard ▪ Evaluation of Organic Finishes ▪ The Six-String Oscillograph ▪ Galvanometry in Vacuo ▪ A Portable Public Address System | ||
| Vol. 13, No. 6 | 1935-02-01 | 1.63 MB | ▪ Disturbances in Radio Transmission ▪ The New Telephotograph System ▪ Vacuum Tubes at Very High Frequencies ▪ Trials of New Wide-Band Program Circuits ▪ A Wire-Wound Grid Resistance ▪ A High Precision Speed Regulator | ||
| Vol. 13, No. 7 | 1935-03-01 | 2.23 MB | ▪ The Ionosphere ▪ A Mirror for the Voice ▪ An Adjustable Oscillator of High Precision ▪ Insulation Resistance of Cotton ▪ Heat Treatment ▪ Depicting Currents in Telephone Lines | ||
| Vol. 13, No. 8 | 1935-04-01 | 1.92 MB | ▪ A 50-KW Radio Transmitter of High Fidelity ▪ Controlled Radiation for Broadcasting ▪ Calling by Whistle ▪ A High-Voltage Relay ▪ Primary Toll Test Boards ▪ Universal Alignment Chart | ||
| Vol. 13, No. 9 | 1935-05-01 | 2.16 MB | ▪ Mechanical Analysis of Waves ▪ A Telephone Set for Outdoor Use ▪ A General-Purpose Frequency Analyzer ▪ A Small Radio Transmitter for Police Duty ▪ A Bridge for Measuring Small Phase Angle ▪ Conduit Plugs ▪ Characteristics of Western Electric Vacuum Tubes | ||
| Vol. 13, No. 10 | 1935-06-01 | 1.86 MB | ▪ A Police Radio System for Newark ▪ A Recording Transmission Measuring Set ▪ A Marine Radio Compass ▪ Quartz Crystal Filters ▪ Dryness in Telephone Cables | ||
| Vol. 13, No. 11 | 1935-07-01 | 1.67 MB | ▪ Coaxial Conductor Systems ▪ Projecting Circuit Performance on a Screen ▪ Recent Advances in Microphonic Research ▪ Measuring Displacements of Microphone Contacts ▪ Short-Wave Programs for Waldorf Guests ▪ Holding the Ticket | ||
| Vol. 13, No. 12 | 1935-08-01 | 1.76 MB | ▪ The Barkhausen Oscillator ▪ Balancing Crosstalk in Toll Cables ▪ A Bone-Conduction Receiver for the Audiphone ▪ The Bridged T Equalizer ▪ A High-Quality Broadcast Transmitter of Medium Power ▪ A New Vacuum Tube for Ultra-High Frequencies | ||
| Vol. 14, No. 1 | 1935-09-01 | 2.15 MB | ▪ Control of Alignment of Sequence Switch Drives ▪ Two Types of Dielectric Polarization ▪ Two-Way Police Radio System ▪ A Mobile Transmitter for the Ultra-High Frequencies ▪ The Dielectric Behavior of Camphor ▪ Heat Treatment in Magnetic Fields ▪ Impact Tester for Moulded Insulating Materials | ||
| Vol. 14, No. 2 | 1935-10-01 | 1.93 MB | ▪ A Non-Directional Microphone ▪ Hysteretic Modulation ▪ Telegraph Testing Facilities ▪ A Speech Amplifier for Police Radio ▪ Centrifugal Type Voltage Regulators ▪ Quiet Amplifier Tubes ▪ Carrier Frequency Heterodyne Oscillator ▪ Soldering Lead Cable Electrically ▪ An Ultra-High-Frequency Radio Receiver for Police Use | ||
| Vol. 14, No. 3 | 1935-11-01 | 4.96 MB | ▪ Vacuum Tube for Small Current Measurements ▪ Acoustical Test Chamber With Cloth Walls ▪ Under-Rug Telephone Cordage ▪ A Radio Beacon Transmitter for WOR ▪ Soft Solders ▪ A Test Car for Marine Radio Telephone Surveys ▪ High-Fidelity Radio Transmitter for Ultra-High Frequencies | ||
| Vol. 14, No. 4 | 1935-12-01 | 2.27 MB | ▪ Earth Current Measurements ▪ Propagation of Ultra-Short Radio Waves ▪ Preparing Metals for Microscopy ▪ Wind From Quartz Crystals ▪ Radio Bridges Hurricane Break ▪ Measuring Inductance of Coils With Superimposed Direct Current ▪ A Radio Transmitter for the Private Flyer ▪ A Bend Tester for Vacuum Tube Wires | ||
| Vol. 14, No. 5 | 1936-01-01 | 1.74 MB | ▪ Novel Design Adapts 3A TWX to Wide Range of Conditions ▪ The 307A Power Pentode ▪ Measuring Delay on Picture-Transmission Circuits ▪ An Adjustable Precision Standard of Phase Difference ▪ A Radio Receiver for the Private Plane ▪ A Radio Compass for Aircraft ▪ Transformer Testing Laboratory | ||
| Vol. 14, No. 6 | 1936-02-01 | 2.10 MB | ▪ The Telephotograph Line ▪ New Carrier Loading Equipment for Entrance Cables ▪ Secretarial Service ▪ Delay Equalizers for Telephotograph Transmission ▪ "Balance" in Railroad Dispatching Circuits ▪ Locating Toll-Cable Faults | ||
| Vol. 14, No. 7 | 1936-03-01 | 2.37 MB | ▪ Electron Diffraction Analysis ▪ Paint Films of Controlled Thickness ▪ Testing Problems in Outside Plant Development ▪ Direction of Motion of Oscilloscope Spot ▪ Sound System for Program Distribution ▪ A Theory of Shielding ▪ Measurements of Noise on Program Circuits ▪ Improved Transmission-Measuring System ▪ An Inexpensive Thousand-Cycle Generator ▪ A Submarine Loading Case | ||
| Vol. 14, No. 8 | 1936-04-01 | 2.14 MB | ▪ Elastic Vibrations of Quartz ▪ Dialing Ships at Sea ▪ Lead Sleeve Cases for Loading Coils ▪ High Permeability and Plastic Flow in Magnetic Fields ▪ An Electrical Stethoscope for the General Pratitioner ▪ Life Test Recorder ▪ Field Trial for New Two-Wire Toll Circuits | ||
| Vol. 14, No. 9 | 1936-05-01 | 1.93 MB | ▪ Electric Wave Guides ▪ A "Hit" Suppresor ▪ Amplitude Compression in Long Telephone Circuits ▪ New Telephone Booth ▪ Testing for Air Contamination in Manholes ▪ Studies of Single-Sideband Short-Wave Transmission ▪ A Broadcast Frequency Measuring Set ▪ A Telephone As a Conference Aid | ||
| Vol. 14, No. 10 | 1936-06-01 | 1.62 MB | ▪ Effect of Electric Shock on the Heart ▪ High-Fidelity Radio Broadcasting ▪ Adhesives ▪ A New Power Amplifier of High Efficiency ▪ X-Ray Diagnosis for Telephone Apparatus ▪ An Acoustic Resistance Meter | ||
| Vol. 14, No. 11 | 1936-07-01 | 1.79 MB | ▪ Multi-Frequency Radio Transmitter ▪ Reforming Telegraph Signals ▪ Automobile Finishes ▪ The 300A Vacuum Tube ▪ Transmission Improvements in Telegraph Loop Circuits ▪ Insuring Quality in Tapes | ||
| Vol. 14, No. 12 | 1936-08-01 | 1.65 MB | ▪ Dowsing for Cable ▪ The Grounded Vertical Radiator ▪ A One-Tube Carrier System ▪ Mathematics and Electrical Communication ▪ The 86 Type Amplifier ▪ A Single-Sideband Short-Wave Receiver | ||
| Vol. 15, No. 1 | 1936-09-01 | 2.50 MB | ▪ An All-Purpose Radio Receiver for Mobile Applications ▪ Teletypewriter Exchange Systems ▪ Molecular Rotation in Organic Crystals ▪ Out-of-Block Protector ▪ Directive Antenna Solves Coverage Problem ▪ Telephone Hand Tools ▪ New Reproducer System for Small Theatres ▪ The Impinger | ||
| Vol. 15, No. 2 | 1936-10-01 | 2.89 MB | ▪ Rubber Research ▪ Determining Circuit Characteristics at Low Frequencies ▪ Developing the 106A1 Regenerative Telegraph Repeater ▪ Remote Control for Radio Receivers ▪ Automatic Comparator for Characters on Perforated Teletypewriter Tape ▪ Automatic Measurement of Transmission | ||
| Vol. 15, No. 3 | 1936-11-01 | 2.06 MB | ▪ Buried Telephone Wire ▪ A New 5-kw Broadcast Transmitter ▪ A Machine for Testing Enameled Wire ▪ Copper Oxide Rectifiers for Telephone Power Supply ▪ Apparatus Card Catalog ▪ Relaxation Time in Dielectrics ▪ Protecting Communication Circuits at Power Stations | ||
| Vol. 15, No. 4 | 1936-12-01 | 3.20 MB | ▪ Synthesizing Speech ▪ A Metallographic Microscope of Exceptional Power ▪ Impact Tester for Organic Finishes ▪ Vacuum Tube Improves Selective Ringing ▪ The 313A Vacuum Tube ▪ Tonlars ▪ A Wide-Range Oscillator for the Higher Frequencies ▪ Protection Against Lightning Interference ▪ Laminated Phenolic Insulating Materials ▪ "The Renaissance of Physics" | ||
| Vol. 15, No. 5 | 1937-01-01 | 2.65 MB | ▪ Talking Battery ▪ How Pitch Changes with Loudness ▪ Non-Spreading Lubricating Oils ▪ Apparatus Specifications ▪ New Carrier System Filters ▪ A Modernized Hearing Meter ▪ Decibel Meters ▪ A New Chair for Operators | ||
| Vol. 15, No. 6 | 1937-02-01 | 2.21 MB | ▪ A Half-Meter Tube ▪ Stabilized Feedback for Radio Transmitters ▪ Measuring the Plating on Screw Threads ▪ Remagnetizer for Ringer Magnets ▪ A Telegraph Signal Biasing Set ▪ Paper Insulation in Telephone Construction ▪ Mercury Switch for Telephone Booths ▪ A Watch-Rate Recorder | ||
| Vol. 15, No. 7 | 1937-03-01 | 2.06 MB | ▪ Modulation in the G-1 Carrier System ▪ Around-the-World Radio Echoes ▪ Fields Caused by Remote Thunderstorms ▪ Sound Reinforcing System for Hollywood Bowl ▪ A New Timing Motor for Oscillographs ▪ Measuring Loudspeaker Response Automatically ▪ Thin Crystals | ||
| Vol. 15, No. 8 | 1937-04-01 | 2.72 MB | ▪ Broad-Band Carrier Systems ▪ Measurement of Attenuation at High Frequencies ▪ A New Noise Meter ▪ A New Message Register Camera ▪ A 5-Megacycle Impedance Bridge ▪ Applying Solderless Cord Tips in the Field ▪ A New Ring for Distributing Frames | ||
| Vol. 15, No. 9 | 1937-05-01 | 1.56 MB | ▪ The Coaxial Cable System ▪ A Noise Reducer for Radio-Telephone Circuits ▪ Conditioning Insulating Materials for Test ▪ Telephotograph Transmitter and Receiver ▪ Terminal Equipment for Telephotography ▪ Regulated Plate Supply | ||
| Vol. 15, No. 10 | 1937-06-01 | 1.66 MB | ▪ Loudness Measurements ▪ Volume Limiter Circuits ▪ A Line-Busy Recorder ▪ The Surface Wave in Radio Transmission ▪ Construction of the Coaxial Cable ▪ Installing the Coaxial Cable | ||
| Vol. 15, No. 11 | 1937-07-01 | 4.66 MB | ▪ The Crossbar Switch ▪ A Power Amplifier Tube for Ultra-High Frequencies ▪ Rectifier for Telephone Power Supply ▪ A High-Quality Headset for Monitoring ▪ Carrier for Coaxial Groups ▪ Group Terminal for the Coaxial System | ||
| Vol. 15, No. 12 | 1937-08-01 | 2.36 MB | ▪ 101-Type Key Equipments ▪ Crosstalk Measurements ▪ A Diverter-Pole Generator for Battery Charging ▪ Repeaters for the Coaxial System ▪ High-Frequency Supply for Degassing | ||
| Vol. 16, No. 1 | 1937-09-01 | 2.04 MB | ▪ Magnetic Recording and Reproducing ▪ Eddy Current Shielding in Laminated Cores ▪ New Tubes for Carrier Systems ▪ Quartz Plates for Frequency Sub-Standards ▪ Vibration Studies with the Rapid Oscillograph | ||
| Vol. 16, No. 2 | 1937-10-01 | 1.62 MB | ▪ The 1A Teletypewriter Switchboard ▪ Equivalent Networks for Negative-Grid Triodes ▪ Supplying Power to Central Offices ▪ An Ultra-Short Wave Circuit for Palomar Observatory ▪ Diphonic Loudspeaker for Mirrorphonic Sound Systems ▪ Limitations in High-Frequency Band Filter Design ▪ A Multi-Channel Radio Monitoring System ▪ High Dispersion X-Ray Spectrometer | ||
| Vol. 16, No. 3 | 1937-11-01 | 4.34 MB | ▪ The Type-H Carrier Telephone System ▪ Low-Cost Microphone for Varied Application ▪ Non-Corroding Rubber Insulation for Telephone Cords ▪ A Filter for Airway Range Systems ▪ An Inexpensive Bridge for Capacitance and Conductance Measurements ▪ Open-Wire Line Losses ▪ High-Frequency Attenuator ▪ Vapor-Pressure Humidostat and Thermostat | ||
| Vol. 16, No. 4 | 1937-12-01 | 1.59 MB | ▪ Coaxial Cable System Transmits Motion Pictures ▪ New Cathode-Ray Tubes ▪ Variation of Cable Loss with Temperature ▪ Transmission Line Structures as High-Frequency Networks ▪ Pressure Cleaning ▪ Forecasting Sunspots and Radio Transmission Conditions ▪ The Isograph—A Mechanical Root-Finder ▪ The Mechanism of the Isograph ▪ Conductance in Telephone Cables | ||
| Vol. 16, No. 5 | 1938-01-01 | 1.89 MB | ▪ Principles of the Musa ▪ Musa Apparatus ▪ Automatic Adjustments in Radio-Telephone Control Terminals ▪ A New Micrometer Ratchet ▪ Aluminum Alloy Structural Materials ▪ The Teletypewriter Exchange Network ▪ The No. 5 Teletypewriter Switchboard ▪ Higher Volumes Without Overloading ▪ A Volume-Limiting Amplifier | ||
| Vol. 16, No. 6 | 1938-02-01 | 1.97 MB | ▪ Television Over the Coaxial Cable ▪ Transmission Characteristics of the Coaxial Structure ▪ An Anti-Static Loop for Aircraft ▪ The Musa from the Outside ▪ The Carrier Telephone Alphabet ▪ Noise Measurements and the International Conference on Acoustics | ||
| Vol. 16, No. 7 | 1938-03-01 | 1.73 MB | ▪ Applying the Type-H Carrier Telephone System to Railroads ▪ Hearing Impairment and Sound Intensity ▪ Higher Magnetic Permeabilities ▪ Experimental Results from the Musa ▪ Permanent Magnet Machines for Telephone Offices ▪ Power Supply for the Coaxial Repeaters ▪ Stability of Reception at Two Meters ▪ Noise Protection for Voice-Operated Devices ▪ Protective Circuits for Antenna-Coupling Networks | ||
| Vol. 16, No. 8 | 1938-04-01 | 1.58 MB | ▪ Broad-Band Carrier System for Cables ▪ Steel in the Telephone Plant ▪ A Multi-Frequency Transmitter for the Private Plane ▪ Improved Methods in Cable Testing ▪ High-Speed Motion-Picture Photography ▪ New Magnetic Telephone ▪ Precise Measurement of Insertion Phase Shift ▪ A Recording System for Transmission Measurements ▪ Console-Type Speech-Input Equipment | ||
| Vol. 16, No. 9 | 1938-05-01 | 1.72 MB | ▪ The U-Type Relay ▪ Electron Multiplier Design ▪ The Y-Type Relay ▪ Channel Terminal Equipment for Broad-Band Carrier Systems ▪ Time Lag in Gas-Filled Photoelectric Cells ▪ Laboratory Tests of Wood Preservatives | ||
| Vol. 16, No. 10 | 1938-06-01 | 1.55 MB | ▪ The Crossbar Switch in the 755 PBX ▪ The 755 PBX ▪ An Inductance and Capacitance Bridge ▪ Making Broadcast Synchronization Easy ▪ Short-Circuiting Relay Protectors ▪ Design Features of Short-Circuiting Relay Protectors ▪ Oscillating Crystal ▪ A New Coastal Marine Radio Telephone Set | ||
| Vol. 16, No. 11 | 1938-07-01 | 1.76 MB | ▪ Carrier Supply for Type K Systems ▪ Paper as a Medium in Microanalysis ▪ Experiments on Talking Contacts ▪ A Voice-Operated Return-Loss Measuring Set ▪ A Teletypewriter Switchboard for Private Line or PBX Service ▪ The 281A Program Line Panel ▪ Gas Tube Voltage Recorders ▪ Tool Kit for Teletypewriter Maintenance | ||
| Vol. 16, No. 12 | 1938-08-01 | 2.00 MB | ▪ Rubber-Insulated Station Cords ▪ Acoustic Delay Circuits for Laboratory Use ▪ Acoustic Attenuators ▪ Improvements in Relay Coil Insulation ▪ Reducing Disturbances Produced on Telephone Circuits by Power Rectifiers ▪ Lifting a Finger Against Noise ▪ Pilot-Wire REgulators for Voice-Frequency Cable Circuits | ||
| Vol. 17, No. 1 | 1938-09-01 | 2.36 MB | ▪ A 50-KW Broadcast Transmitter ▪ Improved Design for Five-Kilowatt Broadcast Transmitter ▪ Electron Analysis of Stearic Acid Films ▪ Charging Control for PBX Batteries ▪ Simplified Balancing Networks for Toll Cables ▪ A Radio Telephone Set for Small Vessels ▪ Regulated Tube Rectifiers Using Magnitude Control ▪ Grid-Controlled Rectification Used in Small 48-Volt Power Plant | ||
| Vol. 17, No. 2 | 1938-10-01 | 1.76 MB | ▪ Noise Prevention in Telephone Circuits ▪ A Call-Thru Test Set ▪ Suppressor-Grid Modulation ▪ Filters for H-1 Carrier Telephone System ▪ A Vogad for Radio-Telephone Control Terminals ▪ General Features of Teletypewriters ▪ Magnetizing by Condenser Discharge ▪ Channel Crystal Filters for Broad-Band Carrier Systems: Electrical Features ▪ Channel Crystal Filters for Broad-Band Carrier Systems: Physical Features | ||
| Vol. 17, No. 3 | 1938-11-01 | 1.47 MB | ▪ Drying Cable Splices by Desiccants ▪ 22A Radio Transmitter ▪ Time Intervals in Telephone Conversation ▪ The New 94-Type Bridging Amplifier ▪ Magnetic Shields ▪ Magnetic Shields for Transformers ▪ Tne No. 4 Order Turret | ||
| Vol. 17, No. 4 | 1938-12-01 | 1.45 MB | ▪ Spacing of Telephone Wires ▪ Ringing Power for Large Offices ▪ Four-Wire Circuits in Retrospect ▪ High-Frequency Attenuation on Open-Wire Lines ▪ Improved Program and Line Amplifiers for the Broadcast Studio ▪ Distributing Time Announcements | ||
| Vol. 17, No. 5 | 1939-01-01 | 1.93 MB | ▪ Generation of Reference Frequencies ▪ Measuring Permeability Under Stress ▪ A Lighted Display Board for Crossbar Calls ▪ Repeaters for the Type-K Carrier System ▪ The 554A Tool ▪ Template for Graphing Audio-Amplifier Performance ▪ Identifying Cable Wires ▪ A Portable Telephone for Railroads ▪ Regulation for Type-K Carrier | ||
| Vol. 17, No. 6 | 1939-02-01 | 1.52 MB | ▪ Pedro the Voder—A Machine That Talks ▪ The Crossbar System ▪ Telephone Alarm Fuses ▪ Long-Distance Conference System ▪ Crosstalk Balancing for the Type-K Carrier System ▪ Crosstalk Poling for the Cable Carrier System ▪ Anti-Vibration Support for Sensitive Portable Galvanometers ▪ Portable Emergency Radio-Telephone Equipment | ||
| Vol. 17, No. 7 | 1939-03-01 | 1.45 MB | ▪ Spectrochemical Analysis ▪ Suppressing Noise and Crosstalk on the Type-K Carrier System ▪ Molded Telephone Apparatus Design ▪ Crossbar Trunking ▪ A New Telegraph Transmission Measuring Set ▪ New Test Set for Identifying Telephone Wires | ||
| Vol. 17, No. 8 | 1939-04-01 | 3.12 MB | ▪ Crossbar Senders ▪ Coördinated Induction Tests on an A-C Electrified Railroad ▪ 356A Vacuum Tube ▪ Power Plant for Broad-Band Repeater Stations ▪ Lockout in Long Telephone Circuits ▪ Sound-Level Distribution Recorder ▪ A New Page Teletypewriter ▪ A Small Pre-Mixing Amplifier | ||
| Vol. 17, No. 9 | 1939-05-01 | 2.33 MB | ▪ The Crossbar Line-Link Frame ▪ A Precision Clock for Telephone Time ▪ Extruded Lead Casings for Condensers ▪ Holding-Magnet Selector for Teletypewriters ▪ The Story of the 2B Regulator ▪ The 17B Oscillator ▪ A Longitudinal-Noise Filter for the Type-K Carrier System ▪ The Multi-Contact Relay | ||
| Vol. 17, No. 10 | 1939-06-01 | 2.40 MB | ▪ Noise at Telephone Locations ▪ Measuring Transmission Speed of the Coaxial Cable ▪ Television Pick-Up Over Telephone Cable Pairs ▪ An Automatic Power Plant for Toll Systems ▪ A Vacuum-Tube Testing Set for Carrier Systems ▪ A General-Purpose Electromagnet ▪ The Bell System at the New York World's Fair 1939 ▪ Sender-Link and Controller Circuits ▪ Originating Markers ▪ A Radio Slide Rule | ||
| Vol. 17, No. 11 | 1939-07-01 | 1.27 MB | ▪ A Cardioid Directional Microphone ▪ Optical Properties of the Alkali Metals ▪ The Anti-Sidetone Station Circuit ▪ A Precise High-Frequency Inductometer ▪ Increasing the Range of Tripping Relays ▪ Number Decoding by Terminating Markers ▪ A Ringing Machine for Small Offices ▪ New Mobile Radio Equipment | ||
| Vol. 17, No. 12 | 1939-08-01 | 1.83 MB | ▪ Sorption of Water by Organic Insulating Materials ▪ Terminating Markers: Busy Testing and Line-Choice Selection ▪ Time Characteristics of the U-Type Relay ▪ Portable High-Frequency Transmission-Measuring Set ▪ Simplifying the Adjustment of Antenna Arrays ▪ Jacks for Main Distributing Frames | ||
| Vol. 18, No. 1 | 1939-09-01 | 1.35 MB | ▪ The Longitudinal Circuit ▪ The Ortho-Technic Audiphone ▪ The 710A Bone-Conduction Receiver ▪ Dialing Incomings ▪ A One-Kilowatt Broadcast Transmitter ▪ Lockout Circuits ▪ Optical Curve Analysis | ||
| Vol. 18, No. 2 | 1939-10-01 | 1.69 MB | ▪ Television Transmission Over Telephone Cables ▪ Crossbar Trunking Studies ▪ A Level Compensator for Carrier-Telegraph Systems ▪ Magnetic Materials Testing ▪ The Spark Chronograph ▪ Continuous Breakdown Test for Enameled Wire ▪ Beryllium Copper | ||
| Vol. 18, No. 3 | 1939-11-01 | 1.28 MB | ▪ Weather by Telephone ▪ Weather-Announcing Tape Machine ▪ An Artificial Mastoid for Audiphone Measurements ▪ A Remotely Controlled Radio Receiver ▪ Gas-Tube Noise Generator for Circuit Testing ▪ Single-Sideband Short-Wave Receiver ▪ Testing Shields for Carrier-Frequency Line Structures ▪ Remote Control of Radio Systems | ||
| Vol. 18, No. 4 | 1939-12-01 | 1.25 MB | ▪ Analysis of World's Fairs' Hearing Tests ▪ The 3B Toll Switchboard ▪ Measuring Lines for Program Transmission: I–The 19-Type Oscillator; II—The 13A Transmission-Measuring Set ▪ Field Tests of the Crossbar System ▪ Beat Notes in High-Frequency Calibration ▪ Operator-Training Facilities at Toll Switchboards ▪ The Vocoder | ||
| Vol. 18, No. 5 | 1940-01-01 | 1.72 MB | ▪ The Manahawkin Musa ▪ Equipment for the Demonstration Toll Call ▪ Automatic Cathode-Ray Oscillograph ▪ Radio Compass for Small Vessels ▪ Transpositions | ||
| Vol. 18, No. 6 | 1940-02-01 | 1.61 MB | ▪ The Coronaviser ▪ Circuit Features of the 3B Toll Board ▪ Feedback Improves Electromechanical Recording ▪ The Exponential Transmission Line ▪ Frequency Modulation ▪ Magnetic Strain Gauge for Cable Sheath ▪ Effect of Extended Signaling Range for Subscriber Loops ▪ New Coils for Operators' Telephone Sets ▪ Laboratory Tests of the Crossbar System | ||
| Vol. 18, No. 7 | 1940-03-01 | 1.93 MB | ▪ A Demonstration of Guided Waves ▪ Crosstalk Balancing Coils for the Type-K Carrier System ▪ High-Speed Motion Pictures of the Human Vocal Cords ▪ The "Telephone Clock" ▪ Outside Plant Field Laboratory ▪ Improved Repeater Tubes | ||
| Vol. 18, No. 8 | 1940-04-01 | 1.36 MB | ▪ A Broad-Band Carrier System for Open-Wire Lines ▪ A Crosstalk Reference Standard ▪ Motor-Driven Switchboard Clock ▪ Crossbar Call-Indicator Pulsing ▪ Electron Diffraction Patterns of Silica and Aluminum Hydrate ▪ Dielectric Loss in Ice ▪ Code Ringing Supply for Community Dial Offices ▪ Metal Horns as Radiators of Electric Waves ▪ An Improved Loud-Speaking Telephone ▪ A Relay Chatter Meter | ||
| Vol. 18, No. 9 | 1940-05-01 | 1.76 MB | ▪ Stereophonic Recordings of Enhanced Music ▪ Stereophonic Reproduction From Film ▪ Intertoll Dialing With Step-by-Step Selectors ▪ Printing Techniques in Analytical Chemistry ▪ Electrographic Printing ▪ Audition Demonstration ▪ Contacts for Crossbar Apparatus ▪ Transmission Features of the Weather Announcement System | ||
| Vol. 18, No. 10 | 1940-06-01 | 1.46 MB | ▪ Hearing-Test Machines at the World's Fairs ▪ Terminal Circuits for the J Carrier System ▪ Telephone Facilities for Airport Traffic Control ▪ A Wiping Solder With Improved Handling Characteristics ▪ Spots on the Sun ▪ The "Vu" and the New Volume Indicator ▪ The 1A Key Telephone System | ||
| Vol. 18, No. 11 | 1940-07-01 | 1.52 MB | ▪ Varistors: Their Characteristics and Uses ▪ Cables for the J Carrier System ▪ Improvements in Drop Wire ▪ Television for National Republican Convention ▪ A Signalling System for Intertoll Dialing ▪ Sound Tests of Telephone Ringers and Dials ▪ Alarm System for Auxiliary Repeater Stations | ||
| Vol. 18, No. 12 | 1940-08-01 | 1.82 MB | ▪ The C5 Carrier System ▪ New Hysteresis Model ▪ The 14C Program Amplifier ▪ Transmission Measuring Set for Outlying Telegraph Stations ▪ Heavy-Water Rochelle-Salt Crystals ▪ A Loud-Speaking Telephone System ▪ Crosstalk Balancing in the J-Carrier System ▪ Determination of the Average Life of Vacuum Tubes | ||
| Vol. 19, No. 1 | 1940-09-01 | 2.34 MB | ▪ Fifteen Years ▪ The Nature of Organic Insulating Materials ▪ Six-Way Directional Microphone ▪ New Voice-Frequency Electrical Delay Network ▪ Unit Ventilator ▪ Synchronized FM Transmitter ▪ Toll Crossbar Call-Distributing System ▪ A Dialing Circuit of Increased Range ▪ Magnetic Ultra-Micrometer | ||
| Vol. 19, No. 2 | 1940-10-01 | 2.01 MB | ▪ A Telephone Set for Explosive Atmospheres ▪ Silicon Carbide Varistors ▪ The C5 Carrier Terminal ▪ J Carrier in the Field ▪ Universal Phonograph Reproducer ▪ Engineering an Improvement in Panel Clutches ▪ Testing the Behavior of Improved Panel Clutches | ||
| Vol. 19, No. 3 | 1940-11-01 | 1.24 MB | ▪ Regulation for the J-2 Carrier Telephone System ▪ Dielectric Properties of Pigmented Rubber ▪ Protecting Switchboard Lamps with Varistors ▪ Wire-Joining Methods ▪ A Bridge for Measuring Core Loss ▪ "A Modern Aladdin's Lamp" ▪ An Interpolation Method for Setting Laboratory Oscillators | ||
| Vol. 19, No. 4 | 1940-12-01 | 1.16 MB | ▪ Thermistors, Their Characteristics and Uses ▪ Devices for Combining DB Levels ▪ Analysis of Losses in Magnetic Cores ▪ "Information" in Less Space ▪ Carrier and Pilot Supply for the J2 Carrier System ▪ Metallic Bridges Between Contact Points ▪ A Coupling Unit for Telephotograph Transmission ▪ Measuring the Air Flow of Small Fans | ||
| Vol. 19, No. 5 | 1941-01-01 | 1.32 MB | ▪ Stevens Point-Minneapolis Coaxial Cable ▪ Measurements of Orchestral Pitch ▪ The 1000-Cycle Ringer-Oscillator ▪ The Copper Oxide Varistor ▪ Repeaters for the C5 Carrier System ▪ Gopher-Protected Cables | ||
| Vol. 19, No. 6 | 1941-02-01 | 1.39 MB | ▪ Batteries in the Telephone Plant ▪ Dust-Storm Static ▪ The 2B Carrier Pilot Channel ▪ Earth Resistivity Measurements ▪ Power-Factor Correction Equipment for Central Offices ▪ Identifying Cable Wires | ||
| Vol. 19, No. 7 | 1941-03-01 | 1.28 MB | ▪ A Twin-Channel Single-Sideband Radio Transmitter ▪ Handling DSA Traffic at Toll Boards ▪ 451A-1 Radio Transmitter ▪ Autotransformer for Emergency Repair of Open-Wire Carrier Circuits ▪ Polarential Telegraph Operation ▪ Visual Ringing Signal ▪ Noise from Shunt Capacitors on Power Systems ▪ An Answering-Time Recorder | ||
| Vol. 19, No. 8 | 1941-04-01 | 1.74 MB | ▪ Remote Control for Reversible Program Circuits ▪ Detecting Faults While Laying Buried Telephone Wire ▪ Locating Hits on Telegraph Circuits ▪ National Defense and the Bell System ▪ "No-Such-Number" Tone for Dial Systems ▪ Studying the Performance of Toll Circuits | ||
| Vol. 19, No. 9 | 1941-05-01 | 1.51 MB | ▪ Step-by-Step Intertoll Dialing ▪ Aerial Cable Lashing Machine ▪ Lashed Aerial Cable ▪ Measuring System for Carrier Circuits ▪ Measurement of Dynamic Characteristics of Vacuum Tubes ▪ Circuit-Riding the Coaxial Cable ▪ Directional Selection for Toll-Line Signaling ▪ Internal Electro-Analysis | ||
| Vol. 19, No. 10 | 1941-06-01 | 1.40 MB | ▪ Film Scanner for Testing Television Transmission ▪ Ten-Frequency Airplane Radio Equipment ▪ Ten-Frequency Transmitter ▪ Ten-Frequency Receiver ▪ Wet Strength Tester for Paper ▪ Dielectric Strength Tests on Aerial Cable ▪ Conical Mandrel for Testing Organic Finishes ▪ The 355A Community Dial Office ▪ New Dial-Testing Machine ▪ Adjustable Filters for the 2B Pilot Channel | ||
| Vol. 19, No. 11 | 1941-07-01 | 1.46 MB | ▪ A Test Set for Pulse Repeaters ▪ Temperature Stability of the 2B Pilot Channel ▪ Electronic Inverter for Interim Power Supply ▪ Sound-Integrating Machine ▪ Telephone Systems Drawings ▪ Bell Laboratories Lecture Equipment ▪ Transmission Talk ▪ Secretarial Key Equipment Using Neon Signals | ||
| Vol. 19, No. 12 | 1941-08-01 | 1.54 MB | ▪ Radio Telephone Service in Chesapeake Bay ▪ Radio Equipment for the Crisfield Project ▪ Peak Voltages in Carrier Telegraphy ▪ Order-Disorder Transformations in Alloy Crystals ▪ Insulating Paper ▪ The Measurement of Modulation in Carrier Amplifiers ▪ Teletypewriter Oiler ▪ Extended Use of Rubber Insulation in Telephone Cords | ||
| Vol. 20, No. 1 | 1941-09-01 | 2.29 MB | ▪ The Mirrophone ▪ Facilities for Handling Large PBX Trunk Groups ▪ Conservation of Defense Materials in the Bell System ▪ Observational Standards ▪ Transcontinental Cable One-Fourth Completed ▪ Stock Records and Control ▪ V1 Telephone Repeater Arrangements ▪ Designing the V1 Repeater and Associated Equipment | ||
| Vol. 20, No. 2 | 1941-10-01 | 2.43 MB | ▪ Automatic Circuit for Determining Load Characteristics ▪ New Coin Collector With Handset ▪ Test for Corrosion of Painted Iron ▪ D-C Substitution Method of Measuring High-Frequency Attenuation ▪ Decentralized Filters for Central-Office Battery Supply ▪ Magnetostriction in Permalloy ▪ "Thru" Selector for Dial Toll Calls ▪ Torque on Silicon Iron Crystal in a Magnetic Field ▪ Crossbar Central B Board | ||
| Vol. 20, No. 3 | 1941-11-01 | 2.43 MB | ▪ Azimuth Indicator for Flying Fields ▪ Automatic Measurement of Crosstalk at Carrier Frequencies ▪ Environmental Factor in Corrosion ▪ Carrier Systems Help Defense Program ▪ 100-Megacycle Cathode-Ray Oscilloscope ▪ Rhombic Antenna Design ▪ Improvements in 755A P.B.X. ▪ Effect of Mounting-Plate Vibration on Relay Operation ▪ Rubber Handset for Linemen ▪ Dial for New Repairman's Test Set ▪ Switching Devices for Toll System Maintenance | ||
| Vol. 20, No. 4 | 1941-12-01 | 2.69 MB | ▪ Telephone Network Aids Air Raid Interceptors ▪ Improved Method of Splicing Rubber-Insulated Wire ▪ A Ten-Megacycle Oscilloscope ▪ The Bell System's Biggest Job ▪ Terminal Equipment for the L1 Carrier System ▪ Varistors as Modulators ▪ Station Keys for Telephones ▪ Routes of Broad-Band Carrier Systems | ||
| Vol. 20, No. 5 | 1942-01-01 | 2.91 MB | ▪ 160-Trunk Incoming Frames ▪ Loading Coils With Cores of Molybdenum Permalloy ▪ Cellulose Acetate Yarn Replaces Silk for Wire Insulation ▪ Stevens Point and Minneapolis Linked by Coaxial System ▪ An Improved Capacitance Bridge for Precision Measurements ▪ Abrasion Test for Finishes | ||
| Vol. 20, No. 6 | 1942-02-01 | 2.54 MB | ▪ Program Switching and Pre-Selection ▪ Mobilization of Science for the War Effort ▪ Generator for Dial and Busy Tones ▪ War-Time Activities of the Laboratories ▪ Preparation for Air Raids ▪ Highlights in the Bell System During 1941 ▪ Crystallinity in Cellulose Esters ▪ Temporary Protection for Cable Splices ▪ Lodgepole Pine Poles | ||
| Vol. 20, No. 7 | 1942-03-01 | 2.34 MB | ▪ Measuring Small Relative Motions in Central-Office Switches ▪ Brittle Temperature of Rubber ▪ A Telephone Set for Exposed Locations ▪ High-Precision Frequency Comparisons ▪ Grounding of High-Gain High-Frequency Amplifiers | ||
| Vol. 20, No. 8 | 1942-04-01 | 2.14 MB | ▪ Behavior of Sulfur in Rubber ▪ Developments of the DSA Board ▪ Air-Raid Signal Demonstrated ▪ New Exchange Area Cable ▪ The C2 Control Terminal for Radio Telephone Circuits ▪ Typing Reperforator | ||
| Vol. 20, No. 9 | 1942-05-01 | 2.30 MB | ▪ Applications of Junction Line Filters ▪ The Junction Line Filter ▪ Small Ringer for Combined Subscriber's Set ▪ Printing Oscillator Scales ▪ A Circuit Continuity Test for the Crossbar System | ||
| Vol. 20, No. 10 | 1942-06-01 | 2.15 MB | ▪ Transoceanic Telephone Cables ▪ Magnetic Fluxmeter ▪ Lead Calcium Test Castings ▪ Portable Teletypewriter Equipment for Army ▪ The World's Telephones ▪ Factors Controlling Man-Made Radio Interference ▪ Suppressing High-Frequency Disturbances from Telephone Apparatus ▪ A Pilot-Channel Regulator for the K-1 Carrier System | ||
| Vol. 20, No. 11 | 1942-07-01 | 2.57 MB | ▪ Determining Color in Telephone Cable ▪ Automatic Production of Oscillator Scales ▪ Repeater for Submarine Telephone Cable ▪ Using Less Tin in Cable Joining ▪ Thickness of Aluminum Oxide Coatings ▪ A Grounded-Plate Amplifier for the F-M Transmitter | ||
| Vol. 20, No. 12 | 1942-08-01 | 2.94 MB | ▪ A Crossbar Tandem Office ▪ Impregnating Varnishes ▪ New Siren Has Successful Trial in New York City ▪ Baskey-Weave Telephone Cords ▪ Rubber Economy in Typewriter Cylinders ▪ Radiation Pattern of the Human Voice | ||
| Vol. 21, No. 1 | 1942-09-01 | 1.50 MB | ▪ Bell Laboratories and the War ▪ Partition Flexibility at Murray Hill ▪ Abrasion Test for Textiles ▪ Quality Control in Ordnance Inspection ▪ Handling Night Calls at a Dial PBX | ||
| Vol. 21, No. 2 | 1942-10-01 | 2.72 MB | ▪ Army-Navy Production Award Presented to the Laboratories ▪ The Job Is to Win ▪ A New Telephone Set for the Hard of Hearing ▪ 3A Code-Call Circuit ▪ A Simplified Tear Test | ||
| Vol. 21, No. 3 | 1942-11-01 | 2.27 MB | ▪ Greensalt Preservative for Telephone Poles ▪ A Spread-Scale Recorder ▪ Salvaging for Victory ▪ New Reference Frequency Equipment ▪ Central DSA Switchboard | ||
| Vol. 21, No. 4 | 1942-12-01 | 3.54 MB | ▪ Waiting for Lightning ▪ No. 7 Information Desk ▪ Sequence Switch Cam ▪ A Bridging Filter for Open-Wire Lines ▪ A New Frequency Divider for Obtaining Reference Frequencies ▪ Drafting Full Speed Ahead ▪ Solubility of Metals in Mercury | ||
| Vol. 21, No. 5 | 1943-01-01 | 2.73 MB | ▪ Stretching Toll Facilities for the Emergency ▪ Outdoor Telephone Booth ▪ Cable Splices and the Hostess Problem ▪ Greensalt Treatment of Poles ▪ Proving-in a Paper Micrometer ▪ Paper Condensers of the Bell System ▪ Radio-Frequency Voltmeter | ||
| Vol. 21, No. 6 | 1943-02-01 | 2.40 MB | ▪ A Super PBX for War Service ▪ School for War Training ▪ Acid Neutralization in Insulating Papers ▪ Rural Telephone Service Using Carrier on Power Lines ▪ Alarm and Comparison Circuits for Reference Frequency Equipment | ||
| Vol. 21, No. 7 | 1943-03-01 | 2.41 MB | ▪ The Signal Corps and the Laboratories ▪ Coastal Radio Telephone Systems ▪ Speeding Communication for the Alcan Highway ▪ Ultra-High Frequencies | ||
| Vol. 21, No. 8 | 1943-04-01 | 2.79 MB | ▪ Rubber Research Laboratory at Murray Hill ▪ Trigger Action from Secondary Electrons ▪ Using High Crystal Harmonics for Oscillator Control ▪ Testing and Rating Air Filters | ||
| Vol. 21, No. 9 | 1943-05-01 | 2.51 MB | ▪ The Philosophy of Toll-Test Boards ▪ Historic Firsts: The High-Vacuum Electronic Tube ▪ Influence of Physics on Chemistry ▪ Ceramics for High-Frequency Insulation ▪ Lightning Protection of Buried Cable ▪ New Synthetic Rubber Developed ▪ Increased Personnel ▪ Telephone Service for Small Army Detachments ▪ Purchase of Keystone System Authorized by F.C.C. ▪ In Uncle Sam's Service | ||
| Vol. 21, No. 10 | 1943-06-01 | 2.98 MB | ▪ Class-of-Service Signals in the Crossbar System ▪ Historic Firsts: Permalloy ▪ How Little Do We Hear? ▪ A Tuned Null Detector ▪ Equipment Features of the V1 Repeater ▪ The Giant Camera ▪ Civil Relief for Service Men ▪ RADAR | ||
| Vol. 21, No. 11 | 1943-07-01 | 2.26 MB | ▪ Electron Diffraction by Large Molecules ▪ Historic Firsts: The Condenser Microphone ▪ Crossbar Temrinating Equipment for Multi-Office Operation ▪ Resistance Lamps ▪ Neutralizing Inducted Voltages in Toll Signaling Circuits | ||
| Vol. 21, No. 12 | 1943-08-01 | 2.85 MB | ▪ Teletypewriter Test Sets ▪ Historic Firsts: Wave Filters ▪ Cable Wrapping Machine ▪ Pulsing Methods of the Dial System for Dial-to-Dial Calls ▪ Dialing Habits of Telephone Users ▪ Communication System Along Alcan Highway Now More Than Two-Thirds Completed ▪ Noise Measurements in Vacuum Tubes ▪ New Headset Permits Signal Men to Wear Helmets | ||
| Vol. 22, No. 1 | 1943-09-01 | 3.13 MB | ▪ FASTAX: An Ultra-High-Speed Motion-Picture Camera ▪ Historic Firsts: Long-Distance Radio Telephony ▪ How Well Do I Hear? ▪ Crossarm Strength Tests ▪ Acoustic Room and Test Apparatus ▪ Rotary Wire-Testing Machine ▪ Multivibrators | ||
| Vol. 22, No. 2 | 1943-10-01 | 2.79 MB | ▪ Gas-Tube Harmocin Generator ▪ Historic Firsts: Thermal Noise ▪ Mica for War Purposes ▪ Unifying Step-by-Step Equipment Arrangements ▪ Photographic Department | ||
| Vol. 22, No. 3 | 1943-11-01 | 2.89 MB | ▪ Philadelphia Adopts Automatic Toll Switching ▪ Historic Firsts: The Thermophone ▪ Locating Buried Cables Electrically ▪ Pulsing Between Dial and Manual Offices ▪ Steel Replaces Copper in Handset Parts ▪ Drop-Wire Painting Tool ▪ Molecular Orientation in Molded Plastics ▪ Communication and Invasion | ||
| Vol. 22, No. 4 | 1943-12-01 | 3.12 MB | ▪ Electrical Gun Director Demonstrated ▪ Carrier System for the Spiral-4 Cable ▪ Historic Firsts: The Negative Feedback Amplifier ▪ Telegraph-Transmission Measuring Set ▪ Outdoor Tests of Wood Preservatives ▪ Amplifier for Subscribers with Impaired Hearing ▪ Minutes Mean Lives | ||
| Vol. 22, No. 5 | 1944-01-01 | 3.26 MB | ▪ Substitute Materials in Telephone Booths ▪ Modernized "Information" for Large PBX's ▪ Historic Firsts: Airplane Radio Telephony ▪ Disintegration of Face Brick by Dissolved Salts ▪ Development of the Electrical Director ▪ Television Over Telephone Cable ▪ Registering "Busy Line" Frequency in the Crossbar System ▪ The Army Salutes Bell Laboratories | ||
| Vol. 22, No. 6 | 1944-02-01 | 2.47 MB | ▪ Flow Properties of Cellulose Esters ▪ Cable Slack-Puller ▪ Power Distribution for Murray Hill Buildings ▪ Crystals of Quartz ▪ Laboratories Engineers Make Parachute Jumps | ||
| Vol. 22, No. 7 | 1944-03-01 | 3.18 MB | ▪ Properties of Paracon ▪ Inspecting and Determining the Axis Orientation of Quartz Crystals ▪ Wood Housing for Outdoor Telephone Sets ▪ Mobile Field Testing Units ▪ Excerpts for A.T. & T. Annual Report ▪ Tinsel for Navy Telephones ▪ Historic Firsts: The Crystal Clock ▪ Captured Enemy Equipment Exhibited at the Laboratories ▪ Underwater Telephone Line | ||
| Vol. 22, No. 8 | 1944-04-01 | 2.58 MB | ▪ Polarographic Studies of Storage Battery Acid ▪ Crossbar Toll Switching System ▪ Processing Quartz ▪ Telephone Sets for Noisy Locations ▪ Relay Contact Welder ▪ An Automatic Vibration Analyzer ▪ Experimental Micro-Wave System Projected | ||
| Vol. 22, No. 9 | 1944-05-01 | 2.91 MB | ▪ Senders of the Crossbar Toll System ▪ Historic Firsts: High-Efficiency Amplifier for Radio Transmitters ▪ Multi-Channel Radio Telephone Spans the Chesapeake Entrance ▪ AT&T Announces Coaxial Program ▪ Portable Carrier Telepgraph for the Signal Corps ▪ Quartz Crystal Model | ||
| Vol. 22, No. 10 | 1944-06-01 | 3.10 MB | ▪ Spectrochemistry ▪ Magneto-Striction Noise from Telephone Wires ▪ Soldering Silicon Carbide Varistors ▪ Wire Communications in Military Operations ▪ Flatness and Parallelism in Quartz Plates ▪ Historic Firsts: The Horizontal Rhombic Antenna ▪ Field-Laboratory Test of Alloy Cable Sheath | ||
| Vol. 22, No. 11 | 1944-07-01 | 2.94 MB | ▪ Automatic Ticketing ▪ Historic Firsts: The Radio Link ▪ Hand Lapper for Quartz Crystals ▪ Call Distribution to Crossbar Toll Operators ▪ Ground Line Treatment of Standing Poles ▪ Metallurgy of Wiped Solder Joints ▪ Coin Collector and Directory Mounting | ||
| Vol. 22, No. 12 | 1944-08-01 | 2.55 MB | ▪ A Crystal Test Set ▪ Telephone Sets for Pipe Lines ▪ Loop Assignment and Selecting Order for Crossbar Toll Systems ▪ Radio Transmitter for the Signal Corps ▪ Low Temperature Properties of Rubbers ▪ A.B. Clark and A. Tradup Visit the European War Zones ▪ Markers for the Crossbar System ▪ Historic Firsts: Quartz Crystal Filters ▪ Nylon for Silk | ||
| Vol. 22, No. 13 | 1944-09-01 | 2.91 MB | ▪ Saving Mica by Testing ▪ Improved Graded Muultiple for Step-by-Step Offices ▪ Multi-Frequency Frame Identification in Crossbar Toll ▪ Historic Firsts: Electro-Magnetic Harmonic Generators ▪ Electrical Test for Moisture in Telephone Poles ▪ Micro-Motion Pictures of Rubber Latex | ||
| Vol. 22, No. 14 | 1944-10-01 | 3.11 MB | ▪ The Career of Frank Baldwin Jewett ▪ Senders for Automatic Ticketing in Step-by-Step Offices ▪ Electrical Director Helps Bring Down Buzz-Bombs ▪ Senders for Automatic Ticketing ▪ Maintenance Center for the Crossbar Toll System ▪ Torque Gauge of Screwdriver Type ▪ Emergency Reporting Systems ▪ New Woods for Crossarms and Their Preservation | ||
| Vol. 22, No. 15 | 1944-11-01 | 3.18 MB | ▪ Traffic Control for Crossbar Toll ▪ Instruction Manuals for the Army and Navy ▪ Major Problems of the Telephone Industry ▪ From the Diary of a Telephone Tradition ▪ Electron Diffraction Patterns of Copper-Gold Alloy ▪ Historic Firsts: Piezo-Electric Oscillator ▪ Drafting Facilities at Murray Hill ▪ Midget Tubes for High Frequencies | ||
| Vol. 22, No. 16 | 1944-12-01 | 2.52 MB | ▪ Electroplating Facilities at Murray Hill ▪ Handling Delayed Calls in Crossbar Toll ▪ To the Solomons and Back ▪ Coaxial Cables and Television Transmission ▪ A 1,000-g Centrifuge ▪ The Identifier—A New Member of the Switching Family ▪ Effect of Chemical Structure on Physical Properties of Synthetic Plastics | ||
| Vol. 23, No. 1 | 1945-01-01 | 1.93 MB | ▪ Tank Radio Set ▪ Historic Firsts: The Heising Modulator ▪ Tensioning Open Wire for J-Carrier Systems ▪ Daylight ▪ Plywood Radio Masts for Sigal Corps ▪ Junctor Grouping in Crossbar Toll ▪ Coördinate Cross-Connectors for Automatic Toll Ticketing | ||
| Vol. 23, No. 2 | 1945-02-01 | 1.53 MB | ▪ Operational Flight Trainer Demonstrated ▪ Rocket Researcher ▪ The Ribbon-Frame Camera ▪ Ten Minutes Over the Patuxent River ▪ War's Hunger for Telephone Plant Revealed in Tales Told by Splicers in Battle Zone ▪ A Meter Test Set ▪ A High-Gain Coxial Antenna | ||
| Vol. 23, No. 3 | 1945-03-01 | 1.24 MB | ▪ Chemically Stabilized Paper Capcitors ▪ Historic Firsts: Zero-Temperature-Coefficient Quartz Crystals ▪ A Volume Limiter for Leased-Line Service ▪ Excerpts From AT&T Annual Report ▪ A Pentode for the Battle Front in Three Days ▪ Bell System Network Facilities for FM Broadcasters ▪ Measurement of Small Motions ▪ Impedance Bridge With a Billion-to-One Range ▪ A Cathode-Ray Bridge Detector | ||
| Vol. 23, No. 4 | 1945-04-01 | 2.06 MB | ▪ Molecular Requirements for Synthetic Rubbers ▪ Manual Calls in Crossbar Toll ▪ Protecting Communications Equipmenbt for the Tropics ▪ The Chemical Laboratories ▪ Microwave Radiation From the Sun ▪ Enemy Versus American Air Power ▪ Self-Service Stockrooms ▪ Effect of Common-Channel Interference on Frequency-Modulation Broadcasting ▪ Wire-Supported Crystals | ||
| Vol. 23, No. 5 | 1945-05-01 | 3.07 MB | ▪ Laying Field Telephone Wire by Airplane ▪ Four-Wire Switching for Crossbar Toll ▪ Historic Firsts: High-Speed Submarine Telegraphy ▪ Tactical Pole Lines ▪ The Laboratories Rises to an Emergency ▪ John Mills ▪ Time and Weather ▪ Understanding the Discharged Veteran ▪ History of First Aid Training at the Laboratories | ||
| Vol. 23, No. 6 | 1945-06-01 | 2.63 MB | ▪ Military Telephone Instruments ▪ Historic Firsts: Copper-Oxide Modulators ▪ Reproductions ▪ United Nations Conference Telephone Service ▪ Synthetic Rubber for Wire Insulation ▪ Murray Hill Laboratories to Be Expanded ▪ Rapid Progress on Coaxial Cable Program Reported by AT&T Co. ▪ "The Plane With a Thousand Eyes" | ||
| Vol. 23, No. 7 | 1945-07-01 | 2.53 MB | ▪ The Voice of Ship Command ▪ Historic Firsts: Wire-Mounted Crystals ▪ Lightning-Protected Cable ▪ Service "On the Double" for Soldiers ▪ Rehabilitating a Telephone System | ||
| Vol. 23, No. 8 | 1945-08-01 | 2.38 MB | ▪ Exploring Magnetic Fields ▪ Scratch Adhesion and Mar Testing of Organic Finishes ▪ Reflex Oscillators ▪ To Leipzig and Back ▪ AT&T Announces Plan for Two-Way Vehicular Telephone Service | ||
| Vol. 23, No. 9 | 1945-09-01 | 2.38 MB | ▪ Polyethylene-Disc Insulators for Coaxials ▪ Radar and the Bell System ▪ Jungle Laboratory ▪ A Recording Camera for Testing Electrical Gun Directors ▪ Historic Firsts: The Peanut Tube ▪ Travelling Telephone Consulant | ||
| Vol. 23, No. 10 | 1945-10-01 | 2.78 MB | ▪ Air-Seal Test Set for Crystal Units ▪ The Outlook for Radio Relaying ▪ Nation-Wide Dialing ▪ Early Bell System Telegraph Services ▪ A Pit Gauge for Ceramic Tubes ▪ The Lookator ▪ Bell Laboratories Displays Its 1944 War Projects | ||
| Vol. 23, No. 11 | 1945-11-01 | 2.90 MB | ▪ Servo-Mechanisms ▪ Historic Firsts: Balancing Networks ▪ High-Speed Movies Under Water ▪ Comabting Enemy Air Activity ▪ Single-Line Telegraphy in Early Bell System Practice ▪ A Splice Detector for Army Field Wire ▪ D. B. Parkinson Visits Germany ▪ Laboratories Leaders Talk to Associated Company Men on Loan to the Laboratories ▪ Survey of German Communications | ||
| Vol. 23, No. 12 | 1945-12-01 | 3.56 MB | ▪ AN/TRC-6—A Microwave Relay System ▪ The 6BP Audiometer ▪ Multi-Frequency Pulsing ▪ Pigment Dispersion in a Synthetic Rubber Latex ▪ Quartz Crystal Plating ▪ Press Demonstration of the AN/TRC-6 | ||
| Vol. 24, No. 1 | 1946-01-01 | 3.07 MB | ▪ Measuring Coaxials at Ultra-High Frequencies ▪ Glass-Sealed Resistors ▪ Visible Speech ▪ Trouble Indicator for the Sender-Link Frame ▪ CF-6-A Carrier Telegraph ▪ Relative Strength of Crossarms ▪ Football via Coaxial | ||
| Vol. 24, No. 2 | 1946-02-01 | 3.02 MB | ▪ Multiple Tube Rocket Launchers ▪ Fatigue Cracking of Coated Lead Alloys ▪ Historic Firsts: The Audiometer ▪ Duplex Crystals ▪ Mobile Service for Inter-City Highways ▪ Scientific and Engineering Texts ▪ The School for War Training ▪ First Call Made Over New Rural Power-Line Carrier ▪ The Whippany Radio Laboratory | ||
| Vol. 24, No. 3 | 1946-03-01 | 2.16 MB | ▪ Building Blocks for Long-Distance Army Communication ▪ Frequency Modulation by Non-Linear Coils ▪ Sulfur in Synthetic Rubbers ▪ Polystyrene Capacitors ▪ Magnetization and Stress ▪ Excerpts from AT&T Annual Report | ||
| Vol. 24, No. 4 | 1946-04-01 | 2.42 MB | ▪ The Bat—Radar-Controlled Glide Bomb ▪ A Wide-Angle Fastax ▪ Exploring Coils ▪ Historic Firsts: The Coaxial System ▪ Demountable Soundproof Rooms ▪ Television Via Coaxial From Washington to New York ▪ An Electro-Mechanical Page Turner ▪ Cable Damage by Gophers ▪ What We Thnk About Held Orders ▪ "Cloverleaf" Antenna for FM Broadcasters | ||
| Vol. 24, No. 5 | 1946-05-01 | 2.87 MB | ▪ Computer for Coastal Guns ▪ Rocket Spinner ▪ Telephone Order-Wire Circuit for Type-K Carrier Routes ▪ Pre-Prodction—A War Service ▪ Radio Lenses ▪ Mg [Magnesium] ▪ "It Helped Sink Six Jap Warships" ▪ Atlantic Highlands Laboratory | ||
| Vol. 24, No. 6 | 1946-06-01 | 2.52 MB | ▪ Preservative Treatment of Wood Cable Reels for Tropical Use ▪ The Multi-Cavity Magnetron ▪ Early Bell System Polar Telegraphy ▪ Radio Relay System Between Chicago and Milwaukee ▪ Government Designations ▪ Telephone Switching ▪ Long-Span Rural Pole Lines ▪ President Gifford at the AT&T Stockholders' Meeting | ||
| Vol. 24, No. 7 | 1946-07-01 | 1.73 MB | ▪ ADP and KDP Crystals ▪ Beachmaster Announcing Equipment ▪ The 6AR6 Tube ▪ Submarine Stalker Now Seeks Oil ▪ Telephone Service for St. Louis Vehicles ▪ Rural Radio Trial in Colorado ▪ Historic Firsts: Vacuum-Tube Voltmeter ▪ Communications in Germany | ||
| Vol. 24, No. 8 | 1946-08-01 | 2.00 MB | ▪ Madam, Will You Talk? ▪ Capacitor Life Testing ▪ Historic Firsts: The Orhophonic Phonograph ▪ A Battery-Ground Pulse Repeater ▪ Polly Gets the Japs ▪ Medal for Merit to R. I. Wilkinson for Service to Air Force | ||
| Vol. 24, No. 9 | 1946-09-01 | 2.06 MB | ▪ Airborne Search Radar ▪ Transoceanic Radio Amplifier ▪ Production of Airplane Radar Speeded by New Testing Technique ▪ Representing the Laboratories at the Front ▪ The Ballad of the Cedar Ants of Penetang | ||
| Vol. 24, No. 10 | 1946-10-01 | 2.66 MB | ▪ The SL Radar ▪ Fastax at Bikini ▪ Testing Tank Set Crystals ▪ Manufacturing Relations Speeds Production ▪ Loading the Spiral-4 for War ▪ Electrical and Mechanical Analogies ▪ Representing the Laboratories at the Front ▪ Waddell at Bikini ▪ | ||
| Vol. 24, No. 11 | 1946-11-01 | 2.13 MB | ▪ The Coaxial Conductor Expands in Size ▪ High-Flying Teletype ▪ Automatic Glazing Machine ▪ SJ Radar for Submarines ▪ Alarm System at Murray Hill ▪ Detecting Corona in Cables ▪ New Field-Wire Loading Coil ▪ | ||
| Vol. 24, No. 12 | 1946-12-01 | 2.58 MB | ▪ Measuring Inter-Electrode Capacitances ▪ The Beam Traveling-Wave Tube ▪ Pocket-Type Adhesion Tester for Organic Coatings ▪ Precision Resistance Networks for Computer Circuits ▪ Non-Linear Coils for Pulse Generators ▪ Blow Hot—Blow Cold: The M-9 Never Failed ▪ The Relay Interpolator ▪ Multi-Channel Two-Tone Radio Telegraphy | ||
| Vol. 25, No. 1 | 1947-01-01 | 2.86 MB | ▪ Examination of Power Coils ▪ The Ballistic Computer ▪ Relay Coils with Improved Longitudinal Balance ▪ Low-Altitude Radar Bombsight ▪ High-Speed Life Test for Capacitor Paper ▪ New FM Broadcast Transmitters ▪ Temperature Control in Coaxial Cable Repeater Huts ▪ Insulation for High-Voltage Pulse Networks ▪ The ABC of the Communications Engineer | ||
| Vol. 25, No. 2 | 1947-02-01 | 3.01 MB | ▪ A Relay Computer for General Application ▪ Submarine Detection by Sonar ▪ Toll Switchboard No. 6 ▪ Navy Fire-Control Radars ▪ The Optical Proximity Fuse ▪ Echoes from the Atmosphere ▪ An Electrical Computer for Flight Training | ||
| Vol. 25, No. 3 | 1947-03-01 | 2.21 MB | ▪ Mr. Bell Invents the Telephone ▪ Measuring Microhardness by Indentation Tests ▪ Double-Speed Teletypewriter Transmission ▪ Echo Boxes for Radar Testing ▪ Continuous Electrical Computation | ||
| Vol. 25, No. 4 | 1947-04-01 | 2.93 MB | ▪ Vehicle Radiotelephony Becomes a Bell System Practice ▪ Magnetic Prospecting ▪ A Compact Lightweight Amplifier for Radar ▪ A Cathode-Ray Telegraph Distortion Measuring Set ▪ Measuring Megohms to a Few Parts in a Million ▪ Bell Centennial Ceremonies at Murray Hill | ||
| Vol. 25, No. 5 | 1947-05-01 | 2.80 MB | ▪ A Voyage By Radar ▪ Television: 20th Anniversary ▪ Ultra-Sound Waves Made Visible ▪ Meter Calibration at Murray Hill ▪ Capacitors for High-Voltage Pulse Networks ▪ Emergency Installation of TC Radio Equipment in Michigan | ||
| Vol. 25, No. 6 | 1947-06-01 | 2.02 MB | ▪ Radar Eyes for the Black Widow ▪ Diffusion of Water Through Plastics ▪ Timer for Radar Echoes ▪ A Submarine Cable Carrier for Foreign War Service ▪ Gun Director Mechanism Moves Microscope for Crossbar Switch Measurements ▪ Charging Chokes in Pulse Generating Circuits ▪ Fixed Station Transmitters for Mobile Radio Telephone | ||
| Vol. 25, No. 7 | 1947-07-01 | 1.69 MB | ▪ A Multiple Output Static Frequency Generator ▪ Pulse Code Modulation ▪ Precision Measurement Made From Projected Negatives ▪ Magnetic Mine Fuse Mechanism ▪ Shunt Tube Control for Thyratron Rectifiers ▪ Research Work in the British General Post Office | ||
| Vol. 25, No. 8 | 1947-08-01 | 1.63 MB | ▪ Responsibility of Management in the Bell System ▪ FT-241A Frequency Control Unit ▪ Structural Features of GR-S Rubber ▪ New Tandem Transposition ▪ Automatic Carriage Return for Radio Teletypewriters ▪ Rural Telephone Service Agreements ▪ Measuring Creep | ||
| Vol. 25, No. 9 | 1947-09-01 | 1.54 MB | ▪ A New Miniature Double Triode ▪ Radio Receivers for Mobile Telephone Service ▪ Teletypewriter System for Slow-Speed Submarine Cables ▪ Space Diversity Reception at Super-High Frequencies ▪ New Coin Chute Reduces Wear and Tear ▪ Glass-Sealed Switches and Relays | ||
| Vol. 25, No. 10 | 1947-10-01 | 2.37 MB | ▪ Piezoelectric Crystal Culture ▪ Carrier Telephones for Farms ▪ Telephotograph Network for the Army Air Force ▪ Early Dreams of Electron Relays ▪ Improvements in D-C Telegraphy ▪ A Telephone Ariadne ▪ A Radio Telephone Transmitter for Auotmobiles ▪ SCR-545-A—A Completely Automatic Tracking Radar | ||
| Vol. 25, No. 11 | 1947-11-01 | 2.58 MB | ▪ A Preview of Radio Relaying ▪ An Automatic Telegraph Service Monitoring Set ▪ Testing Laboratory at Whippany ▪ The Subscriber Terminal for Rural Power-Line Carrier ▪ A Microwave Generator Arranged to Sweep Through a Range of Several Megacycles ▪ Frequency Calibration of Quartz Crystals ▪ Pulse Code Modulation Demonstrated to I.R.E. | ||
| Vol. 25, No. 12 | 1947-12-01 | 3.52 MB | ▪ A Microwave Relay System Between New York and Boston ▪ Frequency-Shift Radio Teletype in World War II ▪ Control of Composition of Synthetic Rubber ▪ Historic Firsts: Electronic Voltage Regulator ▪ A Relay Sensitivity Test Set ▪ What Makes Some Crystals Piezoelectric ▪ What's in a Relay? ▪ Lecture Aids ▪ Ceramincs for Electrical Applications ▪ Windingn Micro-Coils ▪ Planning for the Growth of Radio Communications | ||
| Vol. 26, No. 1 | 1948-01-01 | 3.13 MB | ▪ Power Line Treatment for the M1 Carrier Telephone System ▪ Underground Distribution Wire ▪ Portable Microwave Tower ▪ Telephone Service for Trains ▪ A New Crystal Channel Filter ▪ Historic Firsts: Radio Altimeter ▪ Automatic Switching for Private-Line Teletypewriter Service ▪ Waveguide Hybrids ▪ Models 65 and 66 Hearing Aids | ||
| Vol. 26, No. 2 | 1948-02-01 | 2.62 MB | ▪ Rural Party-Line Service By Radio ▪ Synthetic Hard Rubber ▪ Carrier Telegraphy in the Bell System ▪ Rapid Wetting Test for Solders ▪ Polyrods ▪ High-Frequency Oscilloscopes for Pulses and Other Transients ▪ A Conductive Unbalance Bridge ▪ M1 Carrier: The Common Terminal | ||
| Vol. 26, No. 3 | 1948-03-01 | 2.56 MB | ▪ Terminals for the New York-Boston Radio Relay System ▪ Transmission Features of the M1 Carrier System ▪ Teletype Reperforator Transmitter for Automatic Switching Systems ▪ Supermalloy ▪ Emergency Cord for Coaxial Cable ▪ Multivibrator Step-Down by Fractional Ratios ▪ Rubber and the Weather ▪ Wilson Succeeds Gifford as AT&T President ▪ Queen of Gems May Have Rôle in Telephony | ||
| Vol. 26, No. 4 | 1948-04-01 | 2.50 MB | ▪ Aritifical Dielectric Lenses for Microwaves ▪ Rubber Thermoplastic Jacket for Buried Cable ▪ The Silicon Crystal Detector ▪ Measuring Transmission on Circuits in Use ▪ Slow Acting Relays ▪ High-Speed Teletypewriter Service for the War ▪ Thomas A. Watson Maker of Telephones ▪ Adsorbed Water in Insulation ▪ Electronic Regeneration of Telegraph Signals | ||
| Vol. 26, No. 5 | 1948-05-01 | 2.91 MB | ▪ Repeaters for the New York-Boston Radio Relay System ▪ A Probe for Testing K Amplifiers ▪ Video-Pair Cable ▪ Electropointed Tungsten Wires ▪ Relay Computer for the Army ▪ Historic Firsts: The Start-Stop Oscillator ▪ Microwave "Telescope" Sweeps Sky Path ▪ Wire Telephone Network for New York State Police ▪ Multi-Frequency Key Pulsing ▪ A Movable-Screen Cathode Ray Tube ▪ EDT and DKT Crystals for Carrier Channel Filters | ||
| Vol. 26, No. 6 | 1948-06-01 | 2.24 MB | ▪ The Transmission Circuit Simulator ▪ An Adjustable Waveguide Phase Changer ▪ Historic Firsts: Rectifiers as Modulators ▪ Making Energy Talk ▪ Plotting Board for 65-MC Impedance Measurements ▪ Equipment for Measuring Sound Pressures in the Auditory Canal | ||
| Vol. 26, No. 7 | 1948-07-01 | 2.42 MB | ▪ Repeater Buildings for the First Radio Relay System ▪ Radio Circuits for the Death Valley Area ▪ Historic Firsts: Counting Relays ▪ The "Cloverleaf" Antenna ▪ The 248A Marine Radio Telephone Equipment ▪ Analyzing Relay Characteristics ▪ A High-Precision Test Set Goes to Washington ▪ John Mills 1880-1948 | ||
| Vol. 26, No. 8 | 1948-08-01 | 2.17 MB | ▪ The Transistor ▪ A Distribution Analyzer for Lengths of Impulses ▪ Historic Firsts: The Electrolytic Condenser ▪ A Playback for Visible Speech ▪ The EA Relay ▪ Area Management of Staff Services | ||
| Vol. 26, No. 9 | 1948-09-01 | 2.33 MB | ▪ New Vacuum Tubes for the Very High Frequencies ▪ A 96-Channel Pulse Code Modulation System ▪ The 81-C-1 Teletypewriter Switching System ▪ A Waveguide Branching Filter ▪ Program Transmission Over a 10,750-Mile Circuit ▪ Program Transmission Over Broadband Carrier Systems | ||
| Vol. 26, No. 10 | 1948-10-01 | 2.16 MB | ▪ Precision Carbon Resistors ▪ Stereoscopic Drawing of Crystal Structure ▪ High-Frequency Deposited Carbon Resistors ▪ Beam Deflection Tube for Coding in PCM ▪ Test Sets for Dielectric Faults in Coaxial Cable ▪ Historic Firsts: Crystal Controlled Broadcasting | ||
| Vol. 26, No. 11 | 1948-11-01 | 2.03 MB | ▪ Alpeth Cable Sheath ▪ Historic Firsts: Translation ▪ The License Contract ▪ Atomic Energy ▪ Decoding in PCM ▪ Coaxial Antenna Array for Mobile Service ▪ Joseph P. Davis—Pioneer in Underground Telephone Distribution ▪ Wide Band Crystal Filter for Carrier Program Circuits | ||
| Vol. 26, No. 12 | 1948-12-01 | 2.94 MB | ▪ Cold-Cathode-Tube Test Set ▪ Germanium Varistors ▪ Companding in PCM ▪ Highway Mobile Radio Systems ▪ Magnetic Field Strength Meter ▪ Noise in PCM Systems ▪ Standard Capacitor ▪ Electronics at Allentown ▪ New Automatic Teletype System for Pan American Airways ▪ Philadelphia-Cleveland Coaxial Opened for Telephone Service | ||
| Vol. 27, No. 1 | 1949-01-01 | 2.47 MB | ▪ AMA: An Epoch in Telephone Accounting ▪ Fifty Years of Telephone Repeaters ▪ Timing Control for PCM ▪ Now the Telephone ▪ Meter Scales for Transmission Measurements | ||
| Vol. 27, No. 2 | 1949-02-01 | 1.94 MB | ▪ The V3 Repeater ▪ Bell System Patents and Patent Licensing ▪ Contacts ▪ Splicing Coaxial Connectors ▪ The Goose ▪ The 404A: A Broadband Amplifier Tube ▪ Synchronization for the PCM Receiver ▪ Reginald Lamont Jones, 1886-1949 ▪ AT&T Pushes Biggest Expansion Ever Swung by Private Corporation ▪ Nation-Wide Toll Dialing Makes Its Bow | ||
| Vol. 27, No. 3 | 1949-03-01 | 2.06 MB | ▪ No. 5: The Post-War Crossbar ▪ The Type-A Transistor ▪ Transission Features of the V3 Repeaters ▪ Testing Repeaters with Circulated Pulses ▪ Operating Control of Television Networks ▪ A Typical Move to Murray Hill ▪ Suit Filed to Separate Western Electric from Bell System | ||
| Vol. 27, No. 4 | 1949-04-01 | 2.23 MB | ▪ The 555 PBX ▪ The Coaxial Transistor ▪ Gas Engine Cooling ▪ A Test Set for Mercury Contact Relays ▪ New Control System Safeguards Service Along Coaxial Route ▪ Oxidation of Organic Materials ▪ Measuring Crystal Inductance at High Frequencies ▪ The K2 Carrier System ▪ Telephone Teams Slug It Out With Ice Storms and Blizzards ▪ Bell System Announces 1949 Television Network Program ▪ Edwin H. Colpitts 1872-1949 | ||
| Vol. 27, No. 5 | 1949-05-01 | 1.86 MB | ▪ The New Look in Telephone Instruments ▪ A Microwave Triode for Radio Relay ▪ Cover Sheet for Technical Memoranda ▪ Mobile Radio Antennas for Railroads ▪ Post-War Growth Equals First 45 Years ▪ Electronic Timing Test Set ▪ Television I-F Coil Design ▪ A Tube Test Set for the L1 Carrier System | ||
| Vol. 27, No. 6 | 1949-06-01 | 2.41 MB | ▪ Air-Conditioned Electron Tube Laboratory ▪ The B4 Radio Control Terminal ▪ The Sound Measurements Reference Laboratory ▪ Dynamic Impedance of Regulated Power Supplies ▪ Coaxial Attenuation Standards ▪ The Vail Medal ▪ AT&T and Western File Answer to Government Suit ▪ "Looking Ahead With the Bell System" | ||
| Vol. 27, No. 7 | 1949-07-01 | 2.27 MB | ▪ Mechanical Development of EDT Crystal Units ▪ A 15-KC Carrier Program Channel ▪ John A. Barrett: Pioneer in Telephone Research ▪ The Cover: Inductively Heated Vacuum Furnace ▪ A Harmonic Generator for Audible Ringing ▪ Tunnel Fire Disrupts Communication Circuits | ||
| Vol. 27, No. 8 | 1949-08-01 | 1.14 MB | ▪ Barium-Titanate Ceramic as an Electromechanical Transducer ▪ The Double-Stream Amplifier ▪ V3 Repeaters at Work ▪ Alarm System for No. 5 Crossbar ▪ A New Frequency Scale for Acoustic Measurements ▪ Helen Keller Visits Murray Hill | ||
| Vol. 27, No. 9 | 1949-09-01 | 1.73 MB | ▪ Metallizing Paper for Capacitors ▪ Interoffice Transfer of Alarms in No. 5 Crossbar ▪ A Portable Dial for Network Adjustment ▪ The 40AC1 Carrier Telegraph System ▪ Radioactivity Provides New Tool for Laboratories' Chemists ▪ Microwave Propagation Tests | ||
| Vol. 27, No. 10 | 1949-10-01 | 1.69 MB | ▪ Focusing Sound with Microwave Lenses ▪ The UB Relay ▪ Dr. Shewhart Receives First Impression of Medal in His Honor ▪ Trunking Plan for No. 5 Crossbar ▪ Otto B. Blackwell Retires | ||
| Vol. 27, No. 11 | 1949-11-01 | 2.43 MB | ▪ A General Purpose Tree Wire ▪ A Crystal Weed ▪ Senders for No. 5 Crossbar ▪ Schooling by Telephone ▪ Transmitting Amplifier for the K2 Carrier System ▪ The 111A Key Equipment for Air Traffic Control ▪ Checking Sense of Cut in Quartz Crystals | ||
| Vol. 27, No. 12 | 1949-12-01 | 2.29 MB | ▪ Sound Transmission in Solids at Ultrasonic Frequencies ▪ Register and Sender Frames in No. 5 Crossbar ▪ AEC Signs Contract with Western for Sandia ▪ A Voice-Operated Busy Signal ▪ A Completely Electronic Regenerative Telegraph Repeater ▪ Frank Baldwin Jewett, 1879-1949 | ||
| Vol. 28, No. 1 | 1950-01-01 | 2.57 MB | ▪ Vibrating Reed Selectors for Mobile Telephone Systems ▪ Television Network Expansion ▪ The Original Dial Pulse Register Circuit for the Crossbar System No. 5 ▪ The Case of the Barnacled Crystal ▪ Murray Hill Auditorium as a Listening Room ▪ Bell Laboratories Served by Western's New Teletypewriter Switching Network ▪ Equipment Features of the Cable Carrier System | ||
| Vol. 28, No. 2 | 1950-02-01 | 2.63 MB | ▪ A Message from President Leroy A. Wilson to the Members of the Laboratories ▪ An Intergraph for Semi-Curvilinear Coordinate Paper ▪ Combined Key Set for D-C and Multifrequency Key Pulsing ▪ Connectors for the No. 5 Crossbar System ▪ Memorial Service in Tokyo for Dr. Jewett ▪ Optical Measurements of Residual Stresses in Glass Bulbs ▪ A Variable-Frequency Oscillator Stabilized to High Precision ▪ Telephones in the World ▪ Vibrating Reed Signaling for Mobile Radio ▪ Transmission Line Chart | ||
| Vol. 28, No. 3 | 1950-03-01 | 2.46 MB | ▪ The Laboratories in Monmouth County ▪ Incoming Register Circuits for No. 5 Crossbar ▪ An Impulse Generator for Lightning Studies ▪ Multifrequency Power Supply for Reed Signaling ▪ Incoming Register Link for No. 5 Crossbar ▪ Historic Firsts: Radio Astronomy ▪ Coaxial's New Alarm and Control System ▪ The March to Higher Frequencies | ||
| Vol. 28, No. 4 | 1950-04-01 | 2.75 MB | ▪ The 81-C-1 Teletypewriter Switching System ▪ Multiple Close-Spaced Channels for Mobile Radio ▪ Ten Years' Service Justifies Designers' Confidence ▪ Line-of-Sight Relay Systems—Old and New ▪ Fine-Wire Type Vacuum Tube Grids ▪ Ringing Selection in No. 5 Crossbar | ||
| Vol. 28, No. 5 | 1950-05-01 | 2.46 MB | ▪ Error Detecting and Correcting Codes ▪ Automatic Feed for String Saws ▪ Operator Connections in No. 5 Crossbar ▪ A New Duct-Type Bay for Toll Transmission Equipment ▪ Mu-Beta Effect Chart for Feedback ▪ Extension Flashlight ▪ A Tuned Plate Multivibrator ▪ Crystal-Controlled Clock ▪ Trouble Recording for the No. 5 Crossbar System ▪ Historic Firsts: Far-End Crosstalk Balancing ▪ The Phototransistor | ||
| Vol. 28, No. 6 | 1950-06-01 | 2.88 MB | ▪ Modified Tape Armor and Lepeth Sheath Cable ▪ Design Patterns for No. 5 Crossbar ▪ Radioactive Isotopes in Timber Preservation Studies ▪ Historic Firsts: Sun Spots and Radio ▪ Improvements in Crystal Units for Precise Frequency Control ▪ An Electrical Analog of the Inner Ear ▪ Sender Link Frames for No. 5 Crossbar ▪ Electron Tube Research Laboratory at Murray Hill ▪ The Cathode Ray Sound Spectroscope ▪ Submarine Cable Links Key West-Havana | ||
| Vol. 28, No. 7 | 1950-07-01 | 3.29 MB | ▪ Plastic Covers for Switchboard Cable ▪ Insulation by Cataphoresis ▪ Sealing Solder ▪ Number Group Frame for No. 5 Crossbar ▪ Photographing Sound Waves ▪ Machine for Winding Helices on Ceramics ▪ Phase Measurements for L Carrier Components ▪ Maintenance Facilities for the No. 5 Crossbar System ▪ Bell System Important to Air Defense | ||
| Vol. 28, No. 8 | 1950-08-01 | 2.52 MB | ▪ The Phototransistor ▪ The Automatic Monitor ▪ Sampling a Sound in an Ear ▪ Termintes and Their Control in Telephone Poles ▪ Automatic Frequency Control for Heterodyne Measurements ▪ Telephone Service for the Pentagon Building ▪ Trunk Selection by No. 5 Crossbar Markers ▪ A Summer's Work on the Desert | ||
| Vol. 28, No. 9 | 1950-09-01 | 2.86 MB | ▪ The First Quarter-Century ▪ Angus S. Hibbard—Pioneer Telephone Executive and Inventor ▪ Three-Dimensional Traffic Chart ▪ Equipment Arrangements for No. 5 Crossbar Markers ▪ Automatic Teletypewriter Switching System for Ford ▪ Background Noise in Transistors ▪ New Impedance Bridge Measures Small Resistance Increments ▪ Message Register Operation in No. 5 Crossbar ▪ Thunder in the South | ||
| Vol. 28, No. 10 | 1950-10-01 | 2.39 MB | ▪ Conductivity Measurements at Microwave Frequencies ▪ A Cathod-Ray Rapid-Record Oscillograph ▪ The TD-2 Radio Relay System ▪ Borocarbon Resistors ▪ Tantalum Electrolytic Capacitors ▪ Who Owns the AT&T? ▪ Maxwell Bridge for Measuring Loading Coils ▪ Three-Bay Cabinet for Laboratory and Shop ▪ Bell System Rates for TV Network Service ▪ Permanent Signals in No. 5 Crossbar ▪ Tells of Use of Laboratories Gun Director | ||
| Vol. 28, No. 11 | 1950-11-01 | 2.66 MB | ▪ A Network to Represent the Inner Ear ▪ Walter S. Gifford Named Ambassador ▪ A Precise Decade Oscillator ▪ Register and Sender Testing in No. 5 Crossbar ▪ Stock Expansion Voted ▪ Recent Improvements in the Telephone Clock ▪ Portable Public Address System for Lectures ▪ Optimum Coaxial Lines ▪ Traveling Wave Tubes ▪ No. 5 Crossbar Marker ▪ Business Is a Good Neighbor, Too ▪ Fire Brigade Refresher Course at Murray Hill | ||
| Vol. 28, No. 12 | 1950-12-01 | 3.25 MB | ▪ A Novel Accelerometer ▪ Pulse Conversion in No. 5 Crossbar ▪ Making Unseen Stresses Visable ▪ N-1 Carrier System Goes Into Service ▪ Automatic Transmission Measuring Set ▪ The New 482A Patching Jack ▪ Bell System Prepared for National Emergency ▪ Traffic Registers for No. 5 Crossbar ▪ A Video Monitoring Probe ▪ An Electrical Vocal System | ||
| Vol. 29, No. 1 | 1951-01-01 | 3.14 MB | ▪ Splice Loading Developments ▪ Difficulties of Diagramming the Ear ▪ Traffic Distribution in the No. 5 Crossbar Marker ▪ Detecting Momentary Failures in Capacitors ▪ Amplification at 6-millimeter Wavelength ▪ An Improved Vacuum Fusion Furnace ▪ The LD-B1 Branching Amplifier ▪ Electrons and Holes in Semiconductors | ||
| Vol. 29, No. 2 | 1951-02-01 | 2.99 MB | ▪ Military Flight Service Network ▪ Metallized Paper Capacitors ▪ Historic Firsts: The Retardation of a Moving Clock ▪ No. 5 Crossbar AMA Translator ▪ Test Amplifier for Coaxial Systems ▪ 426A Electron Tube ▪ Laboratories Develop Mechanism for Ten-Cent Calls | ||
| Vol. 29, No. 3 | 1951-03-01 | 2.61 MB | ▪ An Improved Telephone Battery ▪ The General Purpose Analog Computer ▪ Problem Solving with the Analog Computer ▪ W-R-J-M ▪ A Microwave Noise Source ▪ The Telephone 75 Years Ago | ||
| Vol. 29, No. 4 | 1951-04-01 | 2.70 MB | ▪ The New Key West-Havana Telephone Cable ▪ Pulse Testing of Coaxial Cables ▪ Miniature Four-Wire Terminating Set ▪ New Types of Cable Terminals ▪ Waveguide Filters for Pulse Transmission Studies ▪ 425A Electron Tube ▪ The LD-R1 Single Sideband Radio Receiver ▪ Military Electronics Develops New Radar Fire-Control System ▪ What Becomes of the Operators? | ||
| Vol. 29, No. 5 | 1951-05-01 | 2.89 MB | ▪ Problems in Nationwide Dialing ▪ Ferrites: New Magnetic Materials for Communication Engineering ▪ Experimental Preparation of Ferrites ▪ Pulse Code Modulation for Television ▪ A 50-kc to 3.5-mc Hererodyne Oscillator ▪ Pulse Generation and Shaping at Microwave Frequencies ▪ Ohio Bell Offers Answering Service ▪ Defense Projects in the Laboratories ▪ Telecommunication in Great Britain | ||
| Vol. 29, No. 6 | 1951-06-01 | 3.26 MB | ▪ Assembling the Submarine Cable Amplifier ▪ Lepeth Cable Splicing ▪ Automatic Calibration of Film Scales for Oscillators ▪ New Transmitter Tester ▪ Zinc Plating Grows a Beard ▪ How Your Telephone Service Grows ▪ Transmission Measuring System | ||
| Vol. 29, No. 7 | 1951-07-01 | 3.42 MB | ▪ The Switching Systems Laboratories ▪ Computer For Guided Missiles ▪ Mechanically Wrapped Connections ▪ Diesel Engine Sets for Radio Relay ▪ The Radar Range Calculator ▪ Terminals for the TD-2 Radio Relay System ▪ Historic Firsts: Radio-Controlled Airplane ▪ Single-Frequency Signaling System ▪ The Key West-Havana Cable: The Repeater Container | ||
| Vol. 29, No. 8 | 1951-08-01 | 2.97 MB | ▪ Stalpeth Cable Sheath ▪ Repeaters for the TD-2 Radio Relay System ▪ Sound for an Assembly Room ▪ Subscriber Long-Distance Dialing ▪ Laying the New Key West-Havana Submarine Cable System ▪ Western Electric 5755/420A Electron Tube ▪ The 6A Order Turret ▪ Improving Corona Voltage of Coaxial Cables ▪ The Junction Transistor | ||
| Vol. 29, No. 9 | 1951-09-01 | 3.25 MB | ▪ Automatic Message Accounting ▪ Induction Heater Control System ▪ Leaf Spring Vibration Machine ▪ 500 Type Telephone Set ▪ Laboratories' People Away From Home—Point Breeze ▪ No. 5 Crossbar Frames ▪ Coast-To-Coast Radio Relay System Opens ▪ Telephone People Battle the Greatest Flood in the Nation's History | ||
| Vol. 29, No. 10 | 1951-10-01 | 3.17 MB | ▪ The Key West-Havana Cable: An Electron Tube for Subarine Repeaters ▪ A Degreaser for Small Parts ▪ Basic AMA Central Office Features ▪ A Bible of Early Electrical Literature ▪ The 740-E PBX ▪ It Has an Eye for Lines ▪ Bell of Canada to Provide TV Network ▪ Improved U, UA, and Y Type Relays ▪ A New PBX For Small Business Offices ▪ New Ringer for 500-Type Telephone Set | ||
| Vol. 29, No. 11 | 1951-11-01 | 3.39 MB | ▪ Plastic Guards for Aerial Wire ▪ Vocal Gestures ▪ The AMA Tape Perforator ▪ A Transmission Package for the 500 Telephone Set ▪ Cellulose Acetate Filled Coils ▪ Laboratories' People Away From Home: Kearny ▪ Transistor Symposium at Murray Hill | ||
| Vol. 29, No. 12 | 1951-12-01 | 2.76 MB | ▪ Automatic Adjusting Macine for C-Type Ringers ▪ The Cold Cathode Glow Discharge Tube ▪ Exploring Hidden Factors in Speech ▪ Local Wire Video Television Networks ▪ The LD-T2 Radio Transmitter ▪ Recording on AMA Tape in Central Offices ▪ Englewood Begins Long Distance Customer Dialing | ||
| Vol. 30, No. 1 | 1952-01-01 | 3.27 MB | ▪ Signal Translation in Hearing ▪ Shock Testing of Vitrified Clay Conduit ▪ Code Patterns in Telephone Switching and Accounting Systems ▪ Historic Firsts: Lettered Dial ▪ A New Stepping Relay ▪ Broadcast Pick-Up Telephone ▪ The 101-G Power Supply ▪ The Key West-Havana Cable: Electrical Characteristics of Repeaters and Terminals ▪ Mr. Craig Talks at the Laboratories | ||
| Vol. 30, No. 2 | 1952-02-01 | 3.21 MB | ▪ Antennas for the TD-2 ▪ The E1 Telephone Repeater ▪ The Key West-Havana Cable: Repeater Components ▪ The Mass Spectrometer ▪ Bell System to Try Aluminum Wire If Metal Can Be Obtained ▪ Basic Features of the AMA Center | ||
| Vol. 30, No. 3 | 1952-03-01 | 3.27 MB | ▪ Electron Metallography ▪ A "Packaged" Dial Office for Small Communities ▪ Screw Threads: The Development of Standards ▪ The Key West-Havana Cable: Transmission Aspects ▪ Power Plants for the TD-2 Radio Relay System ▪ The AMA Timer ▪ Laboratories People Away From Home: Field Engineering Force | ||
| Vol. 30, No. 4 | 1952-04-01 | 3.17 MB | ▪ TD-2 Radio Switching and Monitoring Equipment ▪ Cable Sheath Repairs ▪ The 108A Protector ▪ Key West-Havana Cable: The Power Plant ▪ New Longitudinal Tape Shield for Video Pair Cable ▪ Central Office Equipment for AMA ▪ New TV Facilities Planned ▪ Twenty-Five Years of Television Transmission ▪ Laboratories Develops Army Telephone Set | ||
| Vol. 30, No. 5 | 1952-05-01 | 1.59 MB | ▪ The 507A and 507B PBX ▪ New Word Counter for Teletypewriter Circuits ▪ Dial for 500 Type Telephone Set ▪ First Southern Radio-Relay Link ▪ The Record Expands its Technical Coverage ▪ The Key West- Havana Cable: Regulated DC Power Supply ▪ An Improved Shadowgraph ▪ The AMA Assembler ▪ A Multiple Exposure Camera | ||
| Vol. 30, No. 6 | 1952-06-01 | 2.14 MB | ▪ The AMA Reader ▪ TransmissioN Beyond the Horizon at Frequencies Between 40 and 4000 Mc ▪ A Recording Fluxmeter of High Accuracy and Sensitivity ▪ Centralized Automatic Message Accounting ▪ Telephone Service for Carrizo Plain Area of California ▪ Type-O Carrier System Goes Into Service ▪ Optical Microscopy: An Adjunct to Engineering and Research ▪ A New General Purpose Relay ▪ Spot Heat for Splicers ▪ Birth of the Loading Coil ▪ Telephone Service for Train Passengers ▪ The Sun in June ▪ Matter of Small Weight | ||
| Vol. 30, No. 7 | 1952-07-01 | 1.71 MB | ▪ Type-N Carrier Telephone System ▪ Electron Microscope Study of Sintering in Thermistor Flakes ▪ An Early Demonstration of Color Television ▪ The AMA Computer ▪ JKT—An All-Purpose Station Wire ▪ The Sorter for Automatic Message Accounting ▪ Loads of Pull | ||
| Vol. 30, No. 8 | 1952-08-01 | 1.61 MB | ▪ Improving the Service Life of Storage Batteries ▪ Handset for the 500-Type Set ▪ The AMA Summarizer ▪ Radio Relay Stations of the TD-2 ▪ Cable Transmission Characteristics for the N Carrier System ▪ Improvements in Subscriber Line Testing | ||
| Vol. 30, No. 9 | 1952-09-01 | 1.88 MB | ▪ Vibralloy—A New Ferromagnetic Alloy ▪ Test Tapes for Automatic Accounting Centers ▪ AT&T Chief Engineer Retires ▪ Solid Sound ▪ Finding Gas Leaks in Cable Sheaths ▪ Recorded Announcement of Toll Line Delays ▪ The AMA Printer ▪ Oliver E. Buckley Retires | ||
| Vol. 30, No. 10 | 1952-10-01 | 1.82 MB | ▪ The Channel Unit of the N1 Carrier ▪ Magnetic Domains ▪ Extreme Cold Opens Way to New Knowledge ▪ Test Unit for AMA Perforators and Readers ▪ Communications Development Training Program | ||
| Vol. 30, No. 11 | 1952-11-01 | 1.33 MB | ▪ Spatial Harmonic Traveling-Wave Amplifier ▪ Craft Milling ▪ Magnetic Tape Editor ▪ Tracking Time Backward in AMA ▪ Handling Coin Calls in No. 5 Crossbar ▪ High Stability 100-Kc Crystal Units for Frequency Standards ▪ Transistors Enter Telephone Service ▪ An Automatic Dial Pulse Recorder ▪ Radio-Relay Route Planned for the Middle West | ||
| Vol. 30, No. 12 | 1952-12-01 | 1.85 MB | ▪ Line Insulation Testing ▪ Cable Dance Damper ▪ New Microwave Route—Kansas City and St. Louis ▪ Recovery and Repair of Telephone Apparatus ▪ High-Speed Machine for Fatigue Studies ▪ Sequence Signaling ▪ 1953 Toll Construction Program ▪ New Putty Keeps in Radio Waves ▪ Accuracy Provisions in AMA ▪ Research in a Saucepan ▪ Alarm and Control Features of the TD-2 ▪ For Doing Two Things at Once ▪ A Story About the Christmas Tree—and the Telephone Relay | ||
| Vol. 31, No. 1 | 1953-01-01 | 5.70 MB | ▪ Systems Engineering in Bell Telephone Laboratories ▪ "B" Lineman's Wrench ▪ Test Set for the M1 Carrier System ▪ A Carrier-Level Adjuster for M1 Carrier Terminals ▪ Dial-Tone and Completing Markers for No. 5 Crossbar ▪ The Howling Telephone ▪ Early Work on Dial Telephone Systems ▪ Reserve Power Generators for Unattended Stations ▪ New York Company to Extend Toll Dialing in Suburbs ▪ New L3 Carrier System Placed on Field Trial ▪ Kansas City-St. Louis Radio Relay System | ||
| Vol. 31, No. 2 | 1953-02-01 | 5.29 MB | ▪ Customer Toll Dialing at Englewood ▪ York, Pa., and Atlantic City Added to Television Network ▪ The N1 Carrier Oscillators ▪ Automatic Digit Recognizer ▪ Additions to Nation-Wide Radio Relay Networks ▪ The AMA Computer: Chargeable Time and Message Unit Computations ▪ Telephone Statistics ▪ Direct Reading Inductance Bridge for Frequencies Up to 5 Mc ▪ Switching Systems as Mechanized Brains ▪ Bombardment Conductivity ▪ Bell System Report for 1952 | ||
| Vol. 31, No. 3 | 1953-03-01 | 1.87 MB | ▪ Performance Studies of AMA Readers and Perforators ▪ New Eight-Party Service for Panel and No. 1 Crossbar ▪ The Early Years of the Strowger System ▪ Improved Contact Flanges for Waveguides ▪ Submarine Telephone Cable for Air Force ▪ Oven Control with Thermistors | ||
| Vol. 31, No. 4 | 1953-04-01 | 1.89 MB | ▪ Paramagnetic Resonance Absorption in Organic Free Radicals ▪ Cold Cathode Counting Tube ▪ Magnetic Adjustment of Receivers for the 500 Type Telephone Set ▪ Tiny Transistor Repeater ▪ A Signaling Circuit for N1 Carrier ▪ Relay Vibration Studies ▪ Historic Firsts: Single-Sideband Transmission ▪ A Substitute Method for Dead-Ending Line Wire ▪ Relay Computer For Network Analysis ▪ Station Installer's Tool Case | ||
| Vol. 31, No. 5 | 1953-05-01 | 2.20 MB | ▪ The No. 23 Auxiliary Operating Room Desk ▪ The No. 23 Auxiliary Operating Room Desk: Circuit Arrangements ▪ Ultrasonic Waves Measure the Elastic Properties of Polymers ▪ Adjustable High Q Inductor for Type-O Carrier ▪ Teletypesetter Equipment in the Bell System ▪ Test Equipment for the TD-2 ▪ Automatic Teletype System | ||
| Vol. 31, No. 6 | 1953-06-01 | 2.05 MB | ▪ Measuring Changes in Length to One Part in a Million ▪ Precise High-Frequency Crystal Units ▪ Measuring the Pull of Relays ▪ Measuring the Load-Displacement in Relays ▪ Wood Stumulates Its Own Destroyer ▪ Switchboards for the Blind ▪ Teletypewriter Word Counter ▪ Heat Dissipation from Toll Transmission Equipment ▪ At the National Academy of Sciences ▪ Fifth Anniversary of Network TV ▪ Robot Secretary ▪ Recorded Stock Quotations | ||
| Vol. 31, No. 7 | 1953-07-01 | 2.14 MB | ▪ Growing Quartz Crystals ▪ A New Test Chamber at Murray Hill ▪ N1 Carrier: System Equalization and Regulation ▪ Color Television Tests ▪ An Experimental Delay Distortion Scanner ▪ More Long Lines Services ▪ A New Teletypewriter ▪ The AMA Called-Office Name Translator ▪ Fifth Anniversary of Transistor Announcement | ||
| Vol. 31, No. 8 | 1953-08-01 | 2.29 MB | ▪ Bakcward-Wave Oscillator ▪ A Hairpin Tube Backward-Wave Oscillator ▪ A Speech Volume Survey on Telephone Message Circuits ▪ Guy Anchors ▪ New Teletypewriter System for Federal Reserve ▪ Adjustable Inductors ▪ A Polarized Relay of Simple Construction ▪ N1 Carrier: Packaging of Equipment ▪ Crystals That Remember | ||
| Vol. 31, No. 9 | 1953-09-01 | 2.51 MB | ▪ Bleeding Temperatures of Creosoted Poles ▪ Information Theory ▪ A Tape-To-Card Converter for Automatic Message Accounting ▪ Historic Firsts: Volume Indicator ▪ Coin Collector Telephone Equipment for Trains ▪ Additions to TV Network ▪ Plane Tickets by Mobile Telephone ▪ N1 Carrier: Repeaters and Group Units ▪ The 3A Timer ▪ Addition to Teletypewriter Network ▪ Improved Time-of-Day Facilities for New York City ▪ Tiny Electronic Switch ▪ Transformer Coils Wound Without Wire ▪ The 4A Toll System Grows ▪ Type-N Carrier Program Service ▪ Electrocardiograms bby Wire | ||
| Vol. 31, No. 10 | 1953-10-01 | 2.67 MB | ▪ The 4A Crossbar Toll System for Nationwide Dialing ▪ Color Control in the Bell System ▪ Auroras—What They Mean to Us ▪ The Cushion Body Belt ▪ The New Message Register ▪ Air Traffic Control System Studies ▪ Largest Business PBX Installed ▪ A New General Purpose Polarized Relay ▪ Pole Mounted N1 Carrier Repeaters ▪ New Interrupter for No. 5 Crossbar ▪ Three-in-one Machine for Making Telephone Cords ▪ Communications at the New Network Airport Terminal ▪ Tinning A Million Miles of Wire | ||
| Vol. 31, No. 11 | 1953-11-01 | 3.09 MB | ▪ New Wire Spring General Purpose Relay ▪ Office of Naval Research Honrs the Laboratories ▪ Analysis of Materials ▪ Network TV Stations Pass 200 ▪ The New Splendor of Switching ▪ The New Telephone Answering Set ▪ Outdoor Exposure Tests at Miami ▪ A New Service Observing Desk ▪ The Compandor in N1 Carrier ▪ Customer Long-Distance Dialing ▪ Communications at U.N. Headquarters ▪ Medical Devices Used in Telephone Manufacturing ▪ Network Color TV Planned | ||
| Vol. 31, No. 12 | 1953-12-01 | 2.50 MB | ▪ Aluminum Conductors in Telephone Cable ▪ Qualitative Spectrochemical Analysis ▪ Thunderhunting ▪ Common-Control Features in Nationwide Dialing ▪ Pulse-Testing TD-2 Antennas ▪ Sequence Charts for Switching Circuits ▪ TWA Installs New Teletype System ▪ A New Crystal Unit for Broadband Carrier Systems ▪ N1 Carrier—Selection of Varistors for Use in Compandors ▪ Telephones Aid Pipeline Installation ▪ CAMA Placed in Service ▪ Long Lines in Color TV Tests | ||
| Vol. 32, No. 1 | 1954-01-01 | 2.83 MB | ▪ The L3 Coaxial Carrier System ▪ Inventing and Patenting at Bell Laboratories ▪ The Englewood Story ▪ Color Timing System for Filter Centers ▪ "Nerve-Type" Transmission Line ▪ Testing Telephone Usefulness ▪ Continuously Recorded Relay Measurements ▪ Transatlantic Telephone Cable to Become a Reality ▪ President Eisenhower Receives the 50-Millionth Telephone | ||
| Vol. 32, No. 2 | 1954-02-01 | 2.94 MB | ▪ Solderless Wrapped Connections ▪ Making Tubes for Research ▪ Automatic Alternate Routing of Telephone Traffic ▪ World Telephones Total 84 Million ▪ Dr. Kelly Discusses "The Contributions of Industrial Research to National Security" ▪ Bells and Lights for Civil Defense ▪ A New Single-Frequency Signaling System ▪ Governors for Dials ▪ Nike Added to Nation's Defense Arsenal | ||
| Vol. 32, No. 3 | 1954-03-01 | 2.70 MB | ▪ Television and the Bell System ▪ Spectrophotomertric Analysis ▪ Emergency Transfer for Essential Services ▪ Telephone Set for Hazardous Areas ▪ A Shock Tester for Small Apparatus ▪ Locating Conductor Faults with Sound "Whistler" ▪ Closed Loop TV for New York Police ▪ Wire Line Entrance Links for TD-2 ▪ Wire Abrasion Tester ▪ Highlights from the AT&T Annual Report ▪ Western Electric Has Record Year ▪ Aluminum Outdoor Telephone Booth | ||
| Vol. 32, No. 4 | 1954-04-01 | 3.02 MB | ▪ A New Type Open-Wire Line for Rural Areas ▪ A Digital Code Wheel ▪ Card-Punching Over Telephone Lines ▪ New Gas Flow Indicator ▪ New Use for Toothpicks ▪ A Mechanical Traveling-Wave Oscillator ▪ Amplifiers for the L3 Coaxial System ▪ Aluminum Die-Castings for N1 Carrier ▪ Electronic Test Set for Signaling Systems ▪ No. 5 Crossbar Opens the Door to Nationwide Customer Dialing ▪ New 12-Channel Bank for Broadband Carrier ▪ Transistorized Rural Carrier Trial Starts | ||
| Vol. 32, No. 5 | 1954-05-01 | 2.94 MB | ▪ Preference Research ▪ Rural Distribution Wire ▪ Precision Potentiometers for Analog Computers ▪ Dr. Kelly Surveys Military and Civilian Uses of Atomic Power at Centennial Science Forum ▪ Cast Resin Terminal Strips ▪ Mechanical Problems of Electron Tubes for L3 Carrier ▪ Ladders and Fungi ▪ New York-Chicago L3 System ▪ No. 5 Crossbar—Marker and Trasverter Testing ▪ Improved Radio Relay for Southern States | ||
| Vol. 32, No. 6 | 1954-06-01 | 2.95 MB | ▪ A Foreword on Transistors ▪ P-N Junctions and the Junction Transistor ▪ Dr. Kelly Receives Industrial Research Institute Medal for 1954 ▪ Type-O Carrier: System Objectives ▪ Type-O Carrier: System Description ▪ A New Multifrequency Receiver ▪ Contact Phenomena in Sealed Containers ▪ Measuring Overhead Wire Clearances ▪ The Bell Solar Battery ▪ New Telephone with Illuminated Dial ▪ The 1954 Share Owners' Meeting ▪ Submarine Cable for Air Force ▪ 300 TV Stations in Network | ||
| Vol. 32, No. 7 | 1954-07-01 | 2.49 MB | ▪ Centralized Automatic Message Accounting ▪ Dr. Kelly Gives Schwab Lecture Before American Iron and Steel Institute ▪ Quality Control and the L3 System ▪ Continuous Scanner for Television Film ▪ Cold-Resin Gas Dams for Telephone Cables ▪ Detached Contact Schematics ▪ No. 5 Crossbar Tandem Revertive-Pulse Incoming Register ▪ Order Wire and Alarm Facilities for Type-N Carrier ▪ Panel System Maintenance | ||
| Vol. 32, No. 8 | 1954-08-01 | 2.66 MB | ▪ Echo and its Effects on the Telephone User ▪ Semiconductors: Characteristics and Devices ▪ Telephone Poles End 25-Year Test in Colorado ▪ Precision Transformers for the L3 System ▪ Senders for the 4A Toll System ▪ Varistor Measuring Techniques ▪ New Super-Speed Teletypewriter Placed in Service ▪ Regulated-Frequency Power Supply for Time-of-Day Machine ▪ Automatic Progression Trunk-Test Circuit | ||
| Vol. 32, No. 9 | 1954-09-01 | 2.69 MB | ▪ Electronic Computers and Telephone Switching ▪ Measuring Telephone Traffic ▪ A New Sound Integrator ▪ Improved Silicon Carbide Varistors ▪ Type-O Channel Circuits ▪ A Noise-Figure Test Set for the TD-2 Radio System ▪ Slow Release Wire-Spring Relay ▪ An Improved Splicer's Test Point ▪ Submarine Telephone Cable to Alaska Planned | ||
| Vol. 32, No. 10 | 1954-10-01 | 2.58 MB | ▪ DIAD—An Experimental Telephone Office ▪ A Universal Telephone Ringer ▪ Centralized AMA Switchboard ▪ New Techniques for Measuring Forces and Wear ▪ Dr. Kelly Warns of Urgent Need for Complete Continental Air Defense System ▪ 70-Megacycle IF Pads ▪ Open-Wire Swing Test ▪ New Ultra-High Frequency Transistor Developed at the Laboratories ▪ Regulation of the L3 Coaxial System ▪ The 100-Pen Recorder ▪ Color Television Now Available to 65 Cities ▪ Line Insulation Test Circuit | ||
| Vol. 32, No. 11 | 1954-11-01 | 2.83 MB | ▪ Redundancy in Television ▪ A New Cable Splice Closure ▪ Radio Programs on N1 Carrier ▪ First Transatlantic Telephone Cable Scheduled to Start Operation in 1956 ▪ Metals with Whiskers ▪ Improved Design of B-Type Relay ▪ Growth of TD-2 Radio Relay ▪ A Comparator for Precise Transfer Conductance Measurements ▪ Decoders and Markers in 4A Toll Crossbar ▪ Increased Efficiency Obtained with Bell Solar Battery ▪ Manufacturing a Transistor ▪ New Telephone Set for the Hard of Hearing ▪ Over-the-Horizon Radio System ▪ New Radio Relay Antenna | ||
| Vol. 32, No. 12 | 1954-12-01 | 2.60 MB | ▪ Switching at Its Boldest ▪ Casting and Potting Resins: Some Chemical Aspects ▪ Miniturized Transmission Transformers ▪ Microwave Testing with Millimicrosecond Pulses ▪ A Long-Lived Packaged Amplifier for Aircraft ▪ A New Intertoll Trunk-Testing Circuit ▪ Code Translation in No. 5 Crossbar ▪ Polyethylene Cable Guard ▪ George A. Campbell 1870-1954 ▪ First L3 System Television Transmission | ||
| Vol. 33, No. 1 | 1955-01-01 | 2.40 MB | ▪ Ultra-High Vacua ▪ The Condenser Microphone as an Acoustic Standard ▪ Telegraph Transmission Coefficients ▪ Molds Assist the Preservative Treatment of Poles ▪ A Precision 30-Mc Admittance Bridge ▪ Repeaters and Group Circuits in Type-O Carrier ▪ New Highways for Long Distance Traffic ▪ Intertoll Features of No. 5 Crossbar ▪ A New Frequency Analyzer | ||
| Vol. 33, No. 2 | 1955-02-01 | 2.29 MB | ▪ Single-Crystal Germanium ▪ The Type-O1 Transposition System ▪ Spring-Type Micro-Balance ▪ Foreign Area Translation in No. 5 Crossbar ▪ Connectors for Cable Shields ▪ Automatic Relay-Adjusting Circuit ▪ Connectors in 4A Toll Crossbar ▪ Drop Wire Clamp Testing Machine ▪ Carrier Terminals for the L3 System ▪ Significant Advances in Communications Marked 1954 | ||
| Vol. 33, No. 3 | 1955-03-01 | 2.85 MB | ▪ Minplas—Miniature Apparatus in Plastic ▪ Electronic Conductors ▪ A Research Study of Germanium Conductivity ▪ Operation of the Card Translator ▪ Bell System Participation in ASTM Pole Research ▪ Service Features of the No. 2 Telegraph Serviceboard ▪ Dislocations in Germanium Crystals ▪ New Machine for Transistor Assembly ▪ Type-O Carrier—Terminal Alarm Circuits ▪ New Long-Distance "Helical" Waveguide ▪ Highlights from the AT&T Annual Report ▪ New Military Telephone System ▪ Plans Filed for Microwave Link with Transatlantic Telephone Cable | ||
| Vol. 33, No. 4 | 1955-04-01 | 2.57 MB | ▪ Junction Tetrode Transistor ▪ Traffic Engineering in Bell Telephone Laboratories ▪ A Short-Haul Microwave Transmitter ▪ A New High-Speed Recording System ▪ Filters for Type-O Carrier ▪ Automatic Alternate Routing in the 4A Crossbar System ▪ High-Voltage Problems in the L3 System ▪ Off-The-Air Pickup Arrangement Proposed by Long Lines Department ▪ Traffic Registration in 4A Toll Crossbar ▪ Stability Evaluation of Switching Apparatus ▪ New Transistor Computer Developed for the Air Force ▪ Western Electric Year-End Report for 1954 ▪ Western Electric to be Prime Contractor on "DEW" Lines | ||
| Vol. 33, No. 5 | 1955-05-01 | 2.52 MB | ▪ Prelashing Aerial Telephone Cable ▪ Efficiency of Bell Solar Battery Almost Doubled ▪ The Field-Effect Transistor ▪ Reflex Klystrons for Microwave Radio Relay Systems ▪ Card Translator Equipment ▪ Repeaters in the L3 Coaxial System ▪ Converting Toll Crossbar Offices for Nationwide Dialing ▪ CAMA—Position Link Circuit ▪ Over-the-Horizon Microwave Transmission | ||
| Vol. 33, No. 6 | 1955-06-01 | 2.44 MB | ▪ Zone-Melting ▪ Analysis of No. 5 Crossbar Trouble Recorder Cards ▪ Dr. Kelly Recommends Graduate Training in Creative Technology for Engineers ▪ Safer Testing Aids ▪ Transistors in the 4A Crossbar System ▪ Power Supply for the L3 System ▪ CAMA—Crossbar Tandem PCI Sender ▪ Semiconductor Diodes ▪ Teletypewriter Billing of Special Toll Calls ▪ The 1955 AT&T Share Owners Meetings | ||
| Vol. 33, No. 7 | 1955-07-01 | 2.59 MB | ▪ The Bell Solar Battery ▪ A Miniature Transistor Amplifier ▪ Outside Plant Field Trials ▪ Traffic Load Control in Toll Crossbar Systems ▪ Electrical Contacts for Transistors and Diodes ▪ Military Radio Control Terminal ▪ Servicing Center for Short-Haul Carrier ▪ CAMA: Transverter and Billing Indexer ▪ Broadband Test Oscillator for the L3 Coaxial Carrier System ▪ New Military Carrier Telephone System | ||
| Vol. 33, No. 8 | 1955-08-01 | 2.28 MB | ▪ The Combination Wire-Wrapping Tool ▪ Strength of Small Metal Specimens ▪ A Military Communication Network Using Wire and Radio ▪ The Translator Card in Toll Crossbar ▪ Atlantic Telephone Cable Laying Started ▪ Improved Testing Instructions for Type-O Carrier ▪ New Silicon Power Rectifier Announced ▪ New Supervisory Control System ▪ Semiconductors—Resistivity and Lifetime Measurements ▪ CAMA—Sender Test Circuit ▪ Army Holds Press Show at Nike Installation | ||
| Vol. 33, No. 9 | 1955-09-01 | 2.26 MB | ▪ Automatic Private-Line Teletypewriter Switching System ▪ Purification of Silicon ▪ Intercepting with Recorded Announcements ▪ Ferroelectric Storage Devices ▪ Molded Plastic Jack Mountings and Terminals ▪ Junction Transistors and Diodes for Power Regulation ▪ Measuring Relative Phase Shift at VHF ▪ A PBX Allotter for No. 5 Crossbar ▪ Sealed Switch Relays for AMA ▪ Landing Site Selected for Alaska Underwater Telephone Cable ▪ Telephone Cable Planned to Link Hawaii to Mainland ▪ Emergency Reporting System Developed at Laboratories | ||
| Vol. 33, No. 10 | 1955-10-01 | 2.38 MB | ▪ The New Volume Control Telephone ▪ "Time of Day" Goes Magnetic ▪ Emergency Radio Telephone System ▪ Precision Ceramics ▪ Improvements in Wiper Springs for Step-by-Step Switches ▪ Grown Junction Transistor Development ▪ Overload Control in No. 5 Crossbar ▪ New Military VHF-UHF Radio Set ▪ Ferrite Isolators at 11,000 Megacycles ▪ Equalization in the L3 System ▪ "Two-Train" Switching in Toll Crossbar Offices ▪ Automatic Wiring Machine Announced | ||
| Vol. 33, No. 11 | 1955-11-01 | 2.25 MB | ▪ Broadband Horn Reflector Antenna ▪ The Inner Structure of Alnico 5 ▪ Code Conversion in No. 5 Crossbar ▪ First Transoceanic Telephone Cable Spans the Atlantic ▪ Program Switching in TD-2 Radio Relay ▪ Gyro Model of Electron Behavior in Ferrites ▪ Circuit Features of the No. 2 Telegraph Serviceboard ▪ AN/TRC-24 Radio Transmitter ▪ Bell Solar Battery in Experimental Service ▪ Bankers "Visit" Murray Hill Via TV | ||
| Vol. 33, No. 12 | 1955-12-01 | 2.42 MB | ▪ Miniature Metallized Lacquer-Film Capacitors ▪ Junction Phototransistors ▪ Coaxial Patch Plugs for TD-2 Radio ▪ Differential Thermal Analysis ▪ Precise Temperature Measurements on Bleeding Poles ▪ Why Storage Batteries? ▪ Space Diversity Arrangement for Radio Teletypewriters ▪ Radio Set AN/TRC-24: Antenna ▪ Adjustable Equalizers for the L3 Coaxial System ▪ Splicers and Pads for Coaxial and Balanced-Pair Cables ▪ In Memoriam—Alva B. Clark | ||
| Vol. 34, No. 1 | 1956-01-01 | 2.26 MB | ▪ Organic Corrosion ▪ Recorded Dictation Using PBX Extension Telephones ▪ Alloyed-Junction Transistor Development ▪ Pulse Equipment for Microwave Antenna Tests ▪ E-Repeater Test Set ▪ New Military Carrier Telephone Systems ▪ Magnetic Test for Relay Cores ▪ A New EA Type Relay ▪ Harmonic Generators for Telephone Tones ▪ Dr. Kelly Sees Bright Future for Communications ▪ Continued Advanced by Bell System in 1955 ▪ "Wide-Screen" Antenna for the Air Force | ||
| Vol. 34, No. 2 | 1956-02-01 | 2.35 MB | ▪ "Over-the-Horizon" Radio Tests ▪ The General Analytical Laboratory ▪ Miniature FM Transistor Transmitter ▪ Pole-Mounted Repeaters and Reserve Power Supplies ▪ Electron Ejection from Metals by Ions ▪ A Capacitor Scanner for Signal Generation ▪ AN/TRC-24 Radio Set: Receiver ▪ New Universal Ringing Power Plant ▪ New Transistor Technology Announced by Laboratories ▪ Bell System Television Networks Extended | ||
| Vol. 34, No. 3 | 1956-03-01 | 2.36 MB | ▪ Speech Bandwidth Compression ▪ Direct Dispatching for Mobile Telephones ▪ Micromanipulators ▪ Crushing of Buried Cable by "Cold" Lightning ▪ Automatic Protection Switching for TD-2 Radio ▪ Improving Mobile Radio System on New York Thruway ▪ Vibration and Electron Tube Reliability ▪ N and K Carrier Systems in the Same Cables ▪ Ralph Bown Completes Distinguished Bell Laboratories Career ▪ Highlights from the AT&T Annual Report ▪ Tone RInger May Replace Telephone Bell ▪ New Contacts for Wire-Spring Relay | ||
| Vol. 34, No. 4 | 1956-04-01 | 2.21 MB | ▪ G.A.S.H.—A Ferroelectric Crystal ▪ The A2A Video Transmission System ▪ Answer-Only Machines in the Bell System ▪ Ships Readied for Laying Alaska Cable ▪ Ferrite Attenuators for Traveling-Wave Amplifiers ▪ The Mechanism of Plastic Deformation ▪ Special Tracking Camera ▪ Electrical and Weather Seal for Microwave Antennas ▪ Trial of TJ Microwave System Planned ▪ The 1A1 Key Telephone System ▪ Versatility of Crossbar Tandem ▪ Precision Current Adjuster ▪ Development of Wire-Spring Relays ▪ "Hard Tube" Pulsers for Radar ▪ Improved Tube Used in TD-2 Radio Relay System ▪ Submarine Cable Repeaters Tested With Radioisotopes | ||
| Vol. 34, No. 5 | 1956-05-01 | 2.50 MB | ▪ Silicon Power Diode Development ▪ Autoatic "Answer Only" Set ▪ A Line-Wire Vibration Damper ▪ Flexibility of the 43A1 Carrier Telegraph System ▪ Chemical Brush Control ▪ Engraving a 58-Inch Linear Scale ▪ Traffic Counting with Line-Insulation Test Frame ▪ Aerial Cable Guide ▪ The Post-War Crossbar Switch ▪ Bell System Chief Engineers Visit Chester Field Laboratory | ||
| Vol. 34, No. 6 | 1956-06-01 | 2.35 MB | ▪ Mechanized Memory and Logic—What Electronics Can Do ▪ Use of Transistor in New Military Telephone System ▪ The Speakerphone ▪ Ultrasonic Delay Lines ▪ Improved Key Handle for PBX Switchboards ▪ Arcing at Telephone Relay Contacts ▪ CAMA—Automatic Trunk-Test Circuit ▪ Repeaters for Twelve-Channel Military Telephone ▪ Wind-Tunnel Hurricanes Used to Test Telephone Equipment ▪ The 1956 AT&T Stockholders Meeting ▪ American Society for Engineering Education Section Meets at Murray Hill Laboratory ▪ Field Trial of Rural Telephone System Concluded in Georgia ▪ San Diego First Large City Added to Nationwide Customer Dialing Network | ||
| Vol. 34, No. 7 | 1956-07-01 | 2.12 MB | ▪ The Role of Quality Assurance in the Bell System ▪ Intermetallic Semiconductors ▪ Color-Coded Rural Wire ▪ Telephone Sets in Color ▪ Variety of Businesses Help Western Electric Supply Bell System Needs ▪ Color Television on the L1 Coaxial Carrier System ▪ Dispatcher's PBX Switchboard ▪ Automatic Recording of Traffic Data ▪ New Hardware for Type-O Carrier ▪ Balanced Revertive-Pulsing Circuits ▪ Radio Set AN/TRC-24: Exciter and Frequency Control | ||
| Vol. 34, No. 8 | 1956-08-01 | 2.39 MB | ▪ Transistorized Rual Carrier System ▪ "Fingerprinting" Relays ▪ The New Aluminum Outdoor Telephone Booth ▪ Telephone Protectors ▪ Attendant's Equipment for Small Dial PBX's ▪ High-Speed Magnetically-Operated Coaxial Switch ▪ Dew Line "Radome" Constructed at Whippany Laboratory ▪ A Modern Method of Current-Drain Calculation ▪ Slide Rule for Design of DC Meters ▪ Laboratories Introduces 5300-Type Telephone ▪ Diffused-base Transistors Available for Military Use ▪ Submarine Cable Laying Operations in Progress ▪ W.E. Expands Manufacturing Plants ▪ Bell System Television Network Routes July 1, 1956 | ||
| Vol. 34, No. 9 | 1956-09-01 | 2.20 MB | ▪ Air Force Submarine Cable System ▪ Point-Contact Transistor Action ▪ An Experimental Picture-phone ▪ Electron Microscopy of Ceramics ▪ Systems Testing in the Switching Laboratory ▪ New Equalizers for Local TV Circuits ▪ Relay Contact Protection ▪ The Splicer's Scissors Become More Versatile ▪ Dry-Reed Switches Manufactured by Automation ▪ Earth Furnishes Variety of Bell System Materials | ||
| Vol. 34, No. 10 | 1956-10-01 | 2.24 MB | ▪ Ferrite Attenuators for Traveling-Wave Amplifiers ▪ Transatlantic Cable Opened to Public Service ▪ Switching at TV Operating Centers ▪ Secretarial Answering Services ▪ Terminals for the New Rural Carrier System ▪ Rapid Line Testing in Crossbar Offices ▪ A Portable Telephone Set for Military Use ▪ New "Watchcase" Terminal for Urban and Rural Wire ▪ AN/TRC-24 Transmitter—RF Power Stages ▪ Dry-Air Pressure System for Exchange Cable | ||
| Vol. 34, No. 11 | 1956-11-01 | 2.33 MB | ▪ Nobel Prize Awarded to Transistor Inventors ▪ Dislocations and Plastic Flow in Germanium ▪ Silicon Carbide Varistors: Properties and Construction ▪ Dr. M. J. Kelly Delivers Convocation Address at Cooper Union ▪ Concentrator-Identifier for Telephone Answering Services ▪ Reducing Distortion in Mobile Radio Systems ▪ Terminals for Sealed Apparatus ▪ Type-ON: New Short-Haul Carrier ▪ Ceremonies Mark Opening of Transatlantic Cable ▪ "Our Mr. Sun" Introduces Bell System Science Series | ||
| Vol. 34, No. 12 | 1956-12-01 | 2.14 MB | ▪ Diffusion in Solids—A Breakthrough in Semiconductor Device Fabrication ▪ Maintenance Support of NIKE ▪ Corrosion—The Constant Enemy of Metals ▪ Heat Dissipation from Electronic Equipment: Transistors-vs-Electron Tubes ▪ Intertoll Trunk Transmission Measuring System ▪ Single-Oscillator Microwave Measuring System ▪ Test Sets for No. 5 Crossbar ▪ Carbon Monoxide Indicator ▪ Drop Wire Cap ▪ Lee de Forest Honored on Golden Anniversary of the "Audion" Tube | ||
| Vol. 35, No. 1 | 1957-01-01 | 2.50 MB | ▪ The Depth of Diffused Layers ▪ Switchboards for Telephone Answering Services ▪ Switching Control at Television Operating Centers ▪ Telephone Service Begins Over New Alaskan Cable ▪ Dial Testing Equipment ▪ First DEW Building Accepted by U.S. Air Force ▪ Power Supplies for the P1 Rural Carrier System ▪ Testing Telephone Cords ▪ Dust on Relay Contacts ▪ Atomic Radiation Used to Study Growth of "Whiskers" On Metals ▪ Bell System Aid to the Blind ▪ Nobel Prizes Awarded in Sweden ▪ AT&T Presudent Frederick R. Kappel Discusses Future of Communications | ||
| Vol. 35, No. 2 | 1957-02-01 | 2.55 MB | ▪ First Transatlantic Telephone Cable System ▪ The Tone Ringer ▪ Coding Tool for Translator Cards ▪ Radio Communication in Railroad Tunnels ▪ Relay Contact Life in Central Offices ▪ Carrier-Frequency Transformers for P1 Carrier ▪ Equalization of Military Carrier Telephone Systems ▪ Engineering Societies Hold Joint Conference Over Transatlantic Cable | ||
| Vol. 35, No. 3 | 1957-03-01 | 2.54 MB | ▪ Bell Laboratories Digital Computers ▪ Performance of the A2A Video Transmission System ▪ Conversion of Automatic Ticketing to AMA ▪ A Transistor Gating Matrix for a Simulated Warfare Computer ▪ Supermendur—An Improved Magnetic Alloy ▪ One-Man Aerial Tent ▪ Modernized Line-Finder Units for Step-by-Step ▪ New Solid-State Oscillator for Microwaves ▪ Dr. Kelly Addresses the American Physical Society ▪ AT&T Issues 1956 Annual Report ▪ Walter H. Brattain Describes Ceremonies at Presentation of Nobel Prize | ||
| Vol. 35, No. 4 | 1957-04-01 | 2.56 MB | ▪ High-Speed Data Transmission ▪ Certain Properties of Ferrites ▪ A Wire-Spring Multicontact Relay ▪ Record Year in 1956 for Western Electric Company ▪ E-Type Repeaters: San Francisco to Oakland Circuits ▪ Divisions of Telephone Numbers in the No. 5 Crossbar System ▪ P1 Rural Carrier: Equipment Features ▪ Nike Hercules Undergoing Final Tests ▪ Thermal Time-Delay Relays ▪ "TJ"—A New Microwave Relay System ▪ Smithsonian Institution Opens New Telephone Exhibit | ||
| Vol. 35, No. 5 | 1957-05-01 | 2.36 MB | ▪ A Metallurgist's View of Metallurgy ▪ Radio-Relay Routes in Virginia and North Carolina ▪ A Remote Line Concentrator for No. 5 Crossbar ▪ Expansion of Holmdel Location Under Study ▪ Magnetography: The Microscopy of Magnetism ▪ Television Terminals for the L3 System ▪ Bell System TV Shows Win Two National Awards ▪ Converting Automatic Ticketing to Automatic Message Accounting ▪ A Basic Modulation Unit for Military Carrier Systems ▪ New Gloves for Linemen ▪ First DEW Line Sites Turned over to Air Force ▪ Nature's Semiconductors | ||
| Vol. 35, No. 6 | 1957-06-01 | 2.57 MB | ▪ Fatigue, Creep, and Relaxation in Metals ▪ Evolution of the Transatlantic Cable ▪ Direct Distance Dialing from Panel and No. 1 Crossbar Offices ▪ Miniature Audio Transformers for the P Carrier System ▪ Chairs for Telephone Operators ▪ New High-Power Transistor Announced by Laboratories Engineers ▪ Four-Channel Military Carrier Terminal and Repeater ▪ Relays in the Bell System: Facts and Figures ▪ Experimental "Drive-In" Coin Telephone ▪ Frederick R. Kappel Addresses AT&T Annual Meeting ▪ New Type of Delay Line Developed at Laboratories | ||
| Vol. 35, No. 7 | 1957-07-01 | 2.33 MB | ▪ A Versatile Source of Millimeter Waves ▪ Diffused-Base Transistors to be Used in Satellite ▪ Pigments in Polymer Materials ▪ Work Begins on Deep-Sea Hawaiian Cable ▪ Automatic Message Accounting Centers in 1957 ▪ Bleeding of Oil-Type Preservatives ▪ Transatlantic Submarine Cable Design ▪ Twelve-Channel Millitary Carrier: Order Circuit and Maintenance ▪ Dr. M. J. Kelly Delivers Keynote Address at European Symposium, M. B. McDavitt Describes TH Microwave System ▪ Lahoratories Announces New Ferroelectric ▪ "Leprechaun" ▪ Laboratories Metallurgical Research Results in New Microwave Ferrites ▪ Elastic Moduli of Diamond ▪ "Punched Sleeves" for Cable Splicing | ||
| Vol. 35, No. 8 | 1957-08-01 | 2.31 MB | ▪ Voice-Actuated Machines: Problems and Possibilities ▪ Marine Tests of Organic Materials ▪ A Broad-Band Microwave Circulator ▪ Wide Use of Short-haul Microwave Predicted ▪ Improvements in Toll Connecting Circuits for Nationwide Dialing ▪ Semi-Automatic Test Set for Varistors ▪ A Capacitance Monitor for Plastic Insulated Wire ▪ CAMA for Step-by-Step Areas ▪ New Ferrite Microwave Amplifier | ||
| Vol. 35, No. 9 | 1957-09-01 | 2.26 MB | ▪ "Recorded Carrier" System for High-Speed Data Transmission ▪ Air-Ground Circuit for Airlines ▪ Conductive and Resistive Coatings ▪ Thermo-Compression Bonding ▪ Cleaning Semiconductor Components ▪ "Languages" of Digital Computers ▪ Automatic Floating-Zone Refining ▪ Pocket-Radio Signaling ▪ Transmission Features of the USAF Submarine Cable System ▪ Distinctive Ringing Signals for the 500 Set ▪ Remote Positions for CAMA | ||
| Vol. 35, No. 10 | 1957-10-01 | 2.26 MB | ▪ SAGE Data Transmisison Service ▪ Novel Sources of Electric Power ▪ Polyethylene Bonded with New Process ▪ Semiconductor Diodes Yield Converter Gain ▪ Traffic-Usage Measuring: They Key to Dial Office Engineering ▪ Tin-Germanium Study Proves Resarch Theory ▪ An Improved Microwave Attenuator for Military Use ▪ Miniaturized Tantalum Solid Electrolytic Capacitors ▪ The AMA Assembler-Computer ▪ An Improved Way to Cut Cylindrical Crystals ▪ "Over-the-Horizon" Service Between Florida and Cuba ▪ Intermarker Group Operation in No. 5 Crossbar ▪ DEW Line Ceremonies Mark Network Completion ▪ "Cosmic Rays" Program on Television October 25 | ||
| Vol. 35, No. 11 | 1957-11-01 | 6.44 MB | ▪ Adhesion of Solids: Principles and Applications ▪ The New School for Operating Company Engineers ▪ Thirty-Foot Antenna for the DEW Line ▪ U.S.-Hawaii Telephone Cable System in Service, Plans for Second Transatlantic System Announced ▪ Field Displacement Isolator in Microwave Communications ▪ Effective Patents: A Cooperative Effort ▪ Frederick R. Kappel Addresses Telephone Pioneers Assembly ▪ Transistors, Reliability and Surfaces ▪ Air-Ground Telephone Trial Over Detroit and Chicago Areas ▪ Line-Insulation Testing for Step-by-Step ▪ Laboratories Papers Presented at National Electronics Conference | ||
| Vol. 35, No. 12 | 1957-12-01 | 2.27 MB | ▪ Simulating Sharpness in Color Television ▪ A Modern Crossbar PBX ▪ The "Twistor" Memory Device ▪ Telephone Communications for RAPCON Centers ▪ Propagation of Millimeter Waves Through the Atmosphere ▪ Microdeviometer for Evaluating Periodic Structures ▪ Cable Splicing Goes Modern ▪ Automatic Calculation of Transmission Deviations ▪ Welding at Relay Contacts ▪ Lightning Protection of TD-2 Stations ▪ A Printer-Comparer-Scanner for AMA | ||
| Vol. 36, No. 1 | 1958-01-01 | 2.44 MB | ▪ Telephone Switching—An Old Field with a New Future ▪ Brittleness in Polyethylene ▪ Pocket-Radio Signaling ▪ New Ground Strip for Electron Tubes ▪ New Auxiliary Station Signals ▪ Magnetic Amplifiers: Basic Principles and Applications ▪ Computing in the AMA Assembluer-Computer ▪ A New Method for Cleaning Wire-Spring Relays ▪ Reading Handwritten Characters ▪ High-Precision Vernier Resolver | ||
| Vol. 36, No. 2 | 1958-02-01 | 2.19 MB | ▪ An Experimental Signature-Verification System ▪ Electrical Breakdown in p-n Junctions ▪ Transistors for Rural Telephone Systems ▪ Traffic Studies of Line Concentration ▪ Voltage Conversion with Transistor Switches ▪ A New Method for Cleaning Sequence Switches ▪ An Improved Multiple-Contact Connector ▪ An Automatic Machine for Temperature Cycling ▪ F. R. Kappel Reports Bell System Growth in 1957 ▪ "The Unchained Goddess" on TV February 12 ▪ Telephone Statistics Show World Trends ▪ Thermal Antioxidants for Polyethylene | ||
| Vol. 36, No. 3 | 1958-03-01 | 1.83 MB | ▪ A Versatile New Intercom System ▪ The Intrinsic-Barrier Transistor—How It Works ▪ Present and Future of the Bell System ▪ Limiting the Temperature in Outside Plant Housings ▪ Radio Links for ON Carrier ▪ An Experimental Signal for Centralized Calling ▪ "Business Needs Basic Research" ▪ C.J. Davisson, 1881-1958 ▪ Farm Housewife Helps Studies of Over-the-Horizon Transmission | ||
| Vol. 36, No. 4 | 1958-04-01 | 2.24 MB | ▪ Printed Circuits ▪ Organic Vapor and Relay Contacts ▪ Electrical Contact with Thermo-Compression Bonds ▪ "BMEWS": Major Communication Project Announced ▪ AT&T Annual Report Cites Gains in 1957 ▪ The Study of Performance in Switching Systems ▪ Line Verification in No. 5 Crossbar ▪ Antenna Filters for a Military Radio System ▪ A New Analysis for Nickel Cathodes ▪ Western Electric Annual Report Shows 1957 Progress ▪ Dataphone Service in Three Bell System Areas ▪ A Field-Effect Varistor | ||
| Vol. 36, No. 5 | 1958-05-01 | 2.28 MB | ▪ The Concept of Automatic Number Identification ▪ A Method for Soldering Aluminum ▪ Continuous Process for Etching Copper ▪ Repair—Philosophy and Documentation ▪ Coordinate Data Sets for Military Use ▪ Beam Focusing in Microwave Amplifiers ▪ Automatically Recording Tube-Life Data ▪ New Portable Electron Tube Tester ▪ Bell Solar Batteries and Transistors in Vanguard Satellite ▪ AT&T Annual Meeting ▪ White Alice Network Completed ▪ Torsional-Wave Delay Lines | ||
| Vol. 36, No. 6 | 1958-06-01 | 2.47 MB | ▪ The Transistor—Ten Years of Progress ▪ Semiconductor Research ▪ Research in Circuits and Systems ▪ Transistor Designs—The First Decade ▪ Transmission Applications ▪ Applications in Telephone Switching ▪ Station Apparatus, Power and Special Systems ▪ Military Applications ▪ Transistor Manufacture ▪ Systems Planning | ||
| Vol. 36, No. 7 | 1958-07-01 | 1.93 MB | ▪ Simulation in Engineering ▪ A Three-Level Sold-State MASER ▪ Electrical Protection for Transistorized Equipment ▪ Low-Noise Amplifier for High Frequencies Uses New Semiconductor Diodes ▪ "Nation's Economic Strength Depends on Business Strength" Kappel Tells Industrial Leaders ▪ Ultrasonic Attenuation in Superconductors ▪ The Trouble Recorder ▪ Germanium Resistance Thermometer ▪ Helium Separation and Purification by Diffusion ▪ J. B. Fisk Heads U.S. Scientist Group for Nuclear-Test Talks | ||
| Vol. 36, No. 8 | 1958-08-01 | 2.26 MB | ▪ White Alice: A New Radio Voice for Alaskan Outposts ▪ All-Numeral Dialing—Would Users Like It? ▪ Cleaning Electron Device Parts ▪ Magnetic Amplifiers: Bistate Operation and Application ▪ Dr. Kelly Praises Achievements of H.S. Black, 1957 Lamme Medalist ▪ Transformers for Military Communications Systems ▪ Ferromagnetism Without Ferromagnetic Elements ▪ Laboratories Marks a Decade of Transistor Progress ▪ New Station Apparatus Being Field-Tested ▪ New TRADIC System Turned Over to Air Force | ||
| Vol. 36, No. 9 | 1958-09-01 | 2.48 MB | ▪ New Protectants for Polyethylene ▪ Janus and Switching ▪ New Pole-Type Building ▪ TRADIC: The First Phase ▪ Selective Signaling and Switching for the SAGE System ▪ Automatic Line-Switching for L3 Carrier ▪ Cape Canaveral Test Center: Transmission Equipment for Submarine Cable ▪ Nike Hercules in Production ▪ Simulation Speeds Research at Bell Laboratories ▪ Shore Operations for European Cable Completed ▪ New Hydrothermal Process for Growing Cultured Sapphires ▪ New Telephone Design to Be Produced in 1959 | ||
| Vol. 36, No. 10 | 1958-10-01 | 2.40 MB | ▪ An Experimental Electronic Switching System ▪ Precision Evaporation and Alloying ▪ Through-Connections for Printed Wiring ▪ A New Coil-Testing Method ▪ Extended CAMA with No. 5 Crossbar ▪ A High-Speed Data Signaling System ▪ A Transistor Amplifier for Operators' Headsets ▪ Telephone Circuits Tested for Data Transmission ▪ "Flash Pyrolysis": New Flash-Heating Technique Initiates Thermal Reactions ▪ "Gateways to the Mind": Latest Science Program to Show Senses at Work ▪ High-Speed Diode for Switching and Computer Applications Announced | ||
| Vol. 36, No. 11 | 1958-11-01 | 2.61 MB | ▪ Studying Tomorrow's Communications… Today ▪ An Experimental Transistorized Telephone ▪ Measuring Time in Central Offices ▪ A New "Ready-Access" Distribution Terminal ▪ Joining Armor Wire for Transoceanic Telephone Cable ▪ A New AMA Translator for No. 5 Crossbar ▪ Teletypewriter Intersystem Operation ▪ New Experimental Booth Made of Plastic Combines Privacy and Visibility ▪ Metal Sputtering: A Promising New Technique for Printed Circuitry ▪ Bell System Aids in Supporting New TV Course in Physics ▪ Measuring Vibration on Telephone Poles ▪ Laboratories Announces Magnetically Regulated High-Voltage DC Supply | ||
| Vol. 36, No. 12 | 1958-12-01 | 2.25 MB | ▪ On-Hook, Off-Hook: Signaling Over the Telephone Network ▪ Transistor Voltage Regulators ▪ An Experimental Gas Diode Switch ▪ New Broad-Band Oscilloscope Tube ▪ Ten Years of AMA ▪ The "Two-in-One" Wire-Spring Relay ▪ Carrier Terminals for the Transatlantic Telephone Cable ▪ Six Papers Are Presented to the IRE Electron Devices Group | ||
| Vol. 37, No. 1 | 1959-01-01 | 2.33 MB | ▪ Development of the DEW Line ▪ Semiconductors in Strain Gauges ▪ Flexible Repeaters for the Transatlantic Telephone Cable ▪ Synthetic Quartz in Pilot Production at Western Electric ▪ An Analog Computer for Evaluating Radar Performance ▪ Broad-Band Oscilloscope—An Application ▪ Crossbar Circuitry for a Small PBX ▪ J.B. Fisk Elected President of Laboratories, M.J. Kelly, Chairman of the Board, E.I. Green, Executive Vice President ▪ A New Correcting Code for Bursts of Errors | ||
| Vol. 37, No. 2 | 1959-02-01 | 2.29 MB | ▪ New Uses for Short-Haul Carrier ▪ The New 9A Announcement System ▪ A "Dry-Land" Ocean at Chester ▪ Nike-Ajax: An Integrated Guided-Missile System ▪ Fittings for Underground Conduit ▪ Terminal for Twelve-Channel Military Telephone ▪ Selective-Calling Teletypewriter Systems ▪ New Shift Register Uses "Twistor" Principle ▪ F.R. Kappel Describes Bell Defense Projects ▪ New Powder-Pattern Technique Delineates Ferroelectric Domains ▪ The Call Director ▪ Soil-Test Program for Materials, Structures | ||
| Vol. 37, No. 3 | 1959-03-01 | 2.14 MB | ▪ TASI: Time Assignment Speech Interpolation ▪ Transistors for Electronic Switching ▪ Test Patterns for Printed-Circuit Materials ▪ Canaveral Test Range: Timing-Signal Transmission ▪ New Method for Splicing Rural and Urban Wires ▪ Message Billing in No. 5 Crossbar CAMA ▪ A New Gauge for Testing Pressurized Cable ▪ Buried Telephone Plant in Residential Areas ▪ M.J. Kelly Retires from Bell Telephone Laboratories ▪ Electronic Circuit Simulates Living Nerve Cell | ||
| Vol. 37, No. 4 | 1959-04-01 | 2.22 MB | ▪ The Merrimack Valley Laboratory ▪ The TJ Radio System ▪ The Nike-Ajax Missile ▪ A Faraday Rotation Switch for the TH System ▪ Polarization Reversal in Barium Titanate ▪ A New Protector for Telephone Lines ▪ AT&T Reports 1958 Progress ▪ Compatible System for Stereophonic Sound Demonstrated Over Television and Radio ▪ "SPUD" is O.E.T.P. Aid | ||
| Vol. 37, No. 5 | 1959-05-01 | 2.14 MB | ▪ The "Information" Problem ▪ Line Scanning in ESS ▪ A Portable Frequency Standard ▪ Signaling in P1 Carrier ▪ Lightweight Aerial Platform ▪ Equalization of Aural and Visual Delay ▪ Jacketed Cords for Telephone Sets ▪ Titan Guidance System Successfully Tested ▪ AT&T Annual Meeting ▪ Laying Begun for First Direct-to-Europe Cable ▪ Field-Effect Tetrode: A Multipurpose Device | ||
| Vol. 37, No. 6 | 1959-06-01 | 2.11 MB | ▪ Missle Guidance ▪ "Even-Count" Cable ▪ A Method of Correcting Errors in Data Transmission ▪ New Equipment for Mobile Telephones ▪ Two-Terminal p-n-p-n Switches ▪ New Methods for Outside Plant Crews ▪ Thermistor Widely Used in Modern Platforms ▪ Capacity Increased for Floating Zone Refiners | ||
| Vol. 37, No. 7 | 1959-07-01 | 1.97 MB | ▪ The Idea of Time Sharing ▪ Plastics for Undersea Cables ▪ A Transistorized Signaling System: Engineering Aspects ▪ Filters for the P1 Carrier System ▪ Power Supplies for the Clarenville-to-Oban Submarine Cables ▪ Low-Melting Glasses for Encapsulating Electronic Devices ▪ High-Temperature Electrical Insulation ▪ Compatible Stereo From Bell Laboratories Featured on Radio | ||
| Vol. 37, No. 8 | 1959-08-01 | 2.19 MB | ▪ The Fine Art of Measurement ▪ Colored Plastics for Wire and Cable ▪ Simulation with Digital Computers ▪ Microwave Radio-Relay Towers ▪ Flexural Noise in Cables ▪ Power for the AFMTC Submarine Cable System ▪ Experimental Set Using Push Buttons Placed on Trial ▪ Field Test of New Dataphone | ||
| Vol. 37, No. 9 | 1959-09-01 | 2.50 MB | ▪ Exotic Radio Communications ▪ The Diffusion of Impurities Into Evaporating Silicon ▪ A Variable-Cycle Announcement Machine ▪ Sorting Methods in Large Business Operations ▪ Message-Waiting Service ▪ 4A and 4M Toll Crossbar With CAMA Equipment ▪ "Communications to Come" ▪ The Radars of Nike-Ajax ▪ New Artificial Larynx From Solid-State Devices ▪ Feedback Problem Solved for Public-Address Systems ▪ Sputtered Resistors Make High Component Density Possible | ||
| Vol. 37, No. 10 | 1959-10-01 | 2.11 MB | ▪ An Experimental Flying-Spot Store for Electronic Switching ▪ The Variable-Capacitance Parametric Amplifier ▪ Ground Broken for New Building at Holmdel ▪ Communications with Large-Scale Computers ▪ No. 4 CAMA and the "Bylink" Circuit ▪ An RF Power Transmitter ▪ Miniature Crystal Filters ▪ Satellite Communication Station Being Built at Holmdel Location for Use in Transmission Tests ▪ New Stepping Transistor Developed by Bell Laboratories ▪ Laboratories to Develop UNICOM Network ▪ Ship Model Built at Chester to Test Cable-Laying Art ▪ Nike-Zeus Test Sites to be Constructed ▪ Western Electric to Build Network for Tracking Mercury Satellite | ||
| Vol. 37, No. 11 | 1959-11-01 | 2.07 MB | ▪ The Twistor: A New Magnetic Memory Element ▪ A Compatible Stereophonic Sound System ▪ Reliability of Glass Seals for Undersea Cables ▪ The Teletrainer ▪ New Dial-Pulse Register for No. 4-Type CAMA ▪ Automatic Control of a Pipeline ▪ A New Coin-Disposal Mechanism for Pay Telephones ▪ President Kappel Speaks to Pioneers on Growth of Telephone Industry ▪ Plates for ESS Memory Processed Automatically ▪ New Reaching Machine Has a Ten-Word Vocabulary | ||
| Vol. 37, No. 12 | 1959-12-01 | 2.21 MB | ▪ A Tester for the Nike Missle Systems ▪ Personal Signaling in Columbus, Ohio ▪ Optical Microscopy: A Key to Metallurgical Progress ▪ Dr. Fisk Again Heading U.S. Group for Nuclear Test Talks at Geneva ▪ A New Coin Telephone ▪ A New Multicontact Connector ▪ A Barrier-Grid Tube Memory ▪ Sources of Temporary Illumination ▪ Bigger Boron Crystals Produced By Floating Zone Melting Method and New "Pressed-Bar" Technique ▪ Mammoth Navy Antenna Will Aid Radio Astronomy Studies ▪ Laying Operations Begin for U.S. to Puerto Rico Cable ▪ New Arrangement for Distortionless Mobile Radio ▪ Nike-Zeus Missile Tested at White Sands | ||
| Vol. 38, No. 1 | 1960-01-01 | 2.18 MB | ▪ Machine Memory in Telephone Switching ▪ Closed-Circuit Educational TV Systems ▪ Mechanical Design of a Flying-Spot Store ▪ A Miniature Lacquer-Film Capacitor ▪ Alumina Powder Used to Protect Electronic Components ▪ An Experimental "Dial-In-Handset" Telephone ▪ The Nike Ajax Computer ▪ New Mexico Site Will Test Effects of Alkaline Soil on Buried Plant Equipment ▪ Western Electric Now Making Traveling Wave Tube for TH Radio Relay System | ||
| Vol. 38, No. 2 | 1960-02-01 | 2.17 MB | ▪ The Complexity of the Transmission Network ▪ A Central Control for ESS ▪ High-Purity Nickel ▪ Leprechaun Computer ▪ A High-Performance Tetrode for TH Radio Relay ▪ Redesign of Low-Frequency Networks ▪ Western Electric Sets Production, Repair Marks ▪ Varactor Diode Used in UHF Radio Receiver | ||
| Vol. 38, No. 3 | 1960-03-01 | 2.20 MB | ▪ Push-Button "Dialing" ▪ Semiconductor Reliability Studies ▪ Magnetic Amplifiers: Analog Operation and Applications ▪ Measuring Line Level on Telephoto Systems ▪ Nike-Zeus Successful in Test Firing at White Sands ▪ New Audio Facilities for Recorded Announcements ▪ Coin Zone Dialing in No. 5 Crossbar ▪ Two Titan Missiles Successfully Guided by Laboratories-Developed Command Guidance System ▪ New Traveling-Wave Aplifier Uses Esaki Diodes ▪ The Laboratories Role in Project Mercury ▪ New Modulator for Millimeter Waves ▪ Laboratories Detection System Finds Missile Nose Cones ▪ New Indoor-Outdoor Phone Booth Designed at the Laboratories | ||
| Vol. 38, No. 4 | 1960-04-01 | 2.13 MB | ▪ Nike in the Air Defense of our Country ▪ New Dimensions in Metallurgy ▪ Logic Circuits for an Electronic Switching System ▪ Radar Interference with Microwave Radio ▪ A New Fluttermeter ▪ Two New Overseas Services Link U.S. with Nassau and Puerto Rico ▪ Annual Report Cites Gains in Earnings and Plant ▪ The Ferreed: A New Magnetic Switch ▪ Voice Message Reflected From Sphere in Space ▪ High-Speed Diode Switch Described to A.I.E.E. | ||
| Vol. 38, No. 5 | 1960-05-01 | 2.18 MB | ▪ Amplifying with Atoms ▪ White Sands Branch Laboratory: Test Center for Nike Missiles ▪ Mechanical and Equipment Design for an Electronic Central Office ▪ Intensity of Sound Affects Listener's Ability to Locate Direction of its Source ▪ Automated Environmental Testing at the Chester Laboratory ▪ Automation in Teletypewriter Switching ▪ Extremely Sensitive Receiver Built with Maser and Low-Noise Antenna ▪ Three Visual Concepts Announced at the American Optical Society Meeting ▪ Tiros Weather Satellite Placed in Orbit by BTL Command Guidance System ▪ Latest Inorganic Glasses Liquid at Room Temperature ▪ Oxygen May be Key to Magnetic Annealing | ||
| Vol. 38, No. 6 | 1960-06-01 | 2.46 MB | ▪ An Experimental "Short-Hop" Microwave System ▪ The Traveling-Wave Tube Goes to Work ▪ Automatic Number Identification ▪ DX Signaling: A Modern Aid to Telephone Switching ▪ 4A and 4M CAMA: Trunk Class Translator ▪ Miniaturized Power Transformers ▪ The Shape Recognizer ▪ A New Noise-Measuring Set ▪ Transparent Gallium Phosphide Prepared as Aid to Semiconductor Research ▪ Record Construction Program Announced at AT&T Annual Meeting ▪ Gallium-Arsenide Diodes Show Improved High-Frequency Performance | ||
| Vol. 38, No. 7 | 1960-07-01 | 2.20 MB | ▪ The Navy's New Defense Against Air Attacks ▪ Sixteen-Channel Banks for Submarine Cables ▪ Transistorized Carrier System for TV ▪ The Direct-Line Emergency Reporting System ▪ Power Supply for TJ Repeaters ▪ 4A and 4M CAMA Routing Arrangements ▪ New Piezoelectric Compounds Exhibit Large Coupling Constant ▪ Hearing Effect Reproduced Electronically ▪ Nike Hercules Destroys Corporal Missile in Test ▪ Electrical Stroboscope Measures Extremely Short Pulses ▪ Epitaxial Film Technique Brings Major Improvements in Diffused-Base Transistor | ||
| Vol. 38, No. 8 | 1960-08-01 | 2.24 MB | ▪ Reliability in Telephone Engineering ▪ The Use of Statistics in Device Development ▪ Simulating Speech Through Space ▪ Current Experiments in Person-to-Person DDD ▪ Circuit Design of an Improved Teletypewriter Switching System ▪ Automatic Processing of Code Plates for Data Storage ▪ Communications in the Space Age | ||
| Vol. 38, No. 9 | 1960-09-01 | 2.28 MB | ▪ The DDD Relay ▪ Simulating Electronic Switching with a Computer ▪ Project Echo Transmits Telephone Messages via Satellite ▪ A Diffused-Silicon Varistor ▪ Emergency Reporting: The Concentrator System ▪ A New Enclosed Main-Frame Connector ▪ Bell System Proposes World Communications Network Via Outer Space ▪ New Efficient Thermoelectric Material ▪ Telephone Conversation Goes by Way of Moon ▪ Successful Public Demonstration of Anti-Feedback Circuit | ||
| Vol. 38, No. 10 | 1960-10-01 | 2.52 MB | ▪ An Electronic Artificial Larynx ▪ Telephone Circuits: A New Link in Data Communications ▪ An Improved Antenna Orientation Method ▪ Transistorized Units for In-Band Signaling ▪ Packaged Buildings for TJ Microwave Systems ▪ A New Design for Power Resistors ▪ Detection of Decay in Treated Wood ▪ Future Submarine Cable Plans Include Cable Ship ▪ New Polyethylene Protectants Discovered ▪ "Catenanes": A New Type of Molecule ▪ A Commercial Use of Desk-Top PBX | ||
| Vol. 38, No. 11 | 1960-11-01 | 1.90 MB | ▪ Infrared and Optical Masers ▪ The CDT-NYU Program ▪ The "ON-over-K" Carrier System ▪ Oxide Masking ▪ Air Gages for Checking Waveguide Dimensions ▪ Test Circuits for Toll Crossbar ▪ F. R. Kappel Talks About New Services ▪ Laboratories Scientists Honored for Outstanding Achievement ▪ New Nike-Zeus Contract to be Directed by Laboratories ▪ New Dimensions in Spring Cords ▪ TASI Aids in Doubling Capacity of Ocean Cable ▪ Laboratories Scores Success in Nike Mobility Program ▪ New Nomenclature Proposed to Aid the Scientist and Engineer | ||
| Vol. 38, No. 12 | 1960-12-01 | 2.17 MB | ▪ ECO Trial Begins ▪ A New Group-Alerting System ▪ Bell System to Build and Launch Active Satellite ▪ Research on Oxide-Coated Cathodes ▪ Magnetic-Latching Crossbar Switches ▪ Canaveral Test Range: Filters and Equalizers for Unattended Repeaters ▪ The "B" Canvas Tray ▪ Nike Zeus Test Center at Kwajalein ▪ All-Number Calling Being Introduced in Bell System ▪ Echo I Used as Space Mail Carrier ▪ Bell System Telephones Reach 60 Million ▪ Home Interphone Service to be Available Throughout the Bell System in 1961 ▪ One Million Princess Phones ▪ Nation's Largest Data-Phone Network Installed | ||
| Vol. 39, No. 1 | 1961-01-01 | 2.26 MB | ▪ "Diodes Can Do Almost Anything" ▪ Engineering for Safety in the Outside Plant ▪ Field Testing an Experimental Telephone ▪ High-Purity Nickel Cathodes: Performance Studies ▪ Directing Naval Weapons ▪ New Air Dryer for Pressurizing Cables ▪ 2.5 Billions for Expansion and Improvement in 1961 ▪ E. I. Green Retires ▪ Nike-Zeus Guidance System Successful ▪ New Postage Stamp Features Echo I ▪ Command Guidance System Guides Tiros II Into Orbit ▪ New Cable Ship To Be World's Largest | ||
| Vol. 39, No. 2 | 1961-02-01 | 2.51 MB | ▪ ESSEX: A New Concept in Telephone Communications ▪ TH Radio Relay System ▪ Quality-Control Techniques Applied to Dial-Office Load Balancing ▪ An Improved Amplifier for Program Circuits ▪ Analysis of Atmospheres in Manufacture of Electronic Devices ▪ Equipment Features of the 82B1 Teletypewriter Switching System ▪ First Computer-Designed Computer Developed by Bell Laboratories ▪ New Look at Over-theHorizon Transmission | ||
| Vol. 39, No. 3 | 1961-03-01 | 1.92 MB | ▪ Research Breakthroughs in Optical Masers and Superconductors ▪ Measuring Semiconductor Lifetime ▪ How Environment Affects Ocean Cables ▪ Automatic Number Identification: Outpulsers and Identifiers ▪ FCC Approves "WATS" Plan ▪ Repeaters for Transatlantic Cables: Passive Components ▪ New Electrochemical Technique for Polishing Semiconductor Wafers ▪ Project Mercury Communications Network Near Completion ▪ Frequencies Authorized for Satellite Communications Experiment ▪ TELPAK: Versatile Broadband Service Offered for Large Volume Communications Users | ||
| Vol. 39, No. 4 | 1961-04-01 | 1.89 MB | ▪ Land Extensions for Transoceanic Cables ▪ Esaki Diodes ▪ Antenna Steering for Echo I ▪ Cathode-Ray Displays in Weapon-Direction Systems ▪ Multistation Operation in the 82B1 Teletypewriter Switching System ▪ Electroforming Waveguide Parts ▪ Antiozonant Research Aims at Better Inhibitors for Elastomers ▪ Optical Masers and Micrography ▪ AT&T Annual Report Describes Technological Advances ▪ New High-Frequency Ultrasonic Transducer | ||
| Vol. 39, No. 5 | 1961-05-01 | 2.30 MB | ▪ Voice Communication System for Air Traffic Control ▪ A Pushbutton PBX Switchboard ▪ New Superconducting Ductile Alloys ▪ Techniques for Microwave Breakdown Measurements ▪ A Concentricity and Diaeter Gage for Ocean Cable ▪ Operator-Training Equipment ▪ Testing Transistors for the Electronic Central Office ▪ World's Largest Antenna for Space Communications ▪ Space Communications Proposal Highlights AT&T Annual Meeting ▪ Bell Laboratories System Guides Satellite and Space Probe ▪ Balloons to Carry ICBM Radar Test Targets ▪ Transatlantic and Caribbean Cables Planned ▪ Testing Telephones for Tomorrow | ||
| Vol. 39, No. 6 | 1961-06-01 | 2.17 MB | ▪ Missile Impact Locating System ▪ Central-Office Receiver for Touch-Tone Calling ▪ New Way to Seal Cable Joints ▪ Transistor Development for Manufacture ▪ Computer Indexes Scientific Documents ▪ High-Speed Photography and Micrography ▪ Card Dialer Telephone Will Be Marketed ▪ Metering Gas in Telephone Cables ▪ Speeding Calls Through a PBX ▪ Mercury Communications Network Completed | ||
| Vol. 39, No. 7 | 1961-07-01 | 2.19 MB | ▪ SAC's Primary Alerting System ▪ Overseas Dialing: A Step Toward Worldwide Telephony ▪ Air-Drying Apparatus for Microwave Systems ▪ F. R. Kappel Stresses Defense Communications ▪ A Self-Protecting Transistor for the E-6 Repeater ▪ Training Simulator for Flight Controllers ▪ Static Frequency-Generators for Ringing Power ▪ Sapphires to Protect Telephone Satellites From Space Hazards ▪ Service Quickly Restored After Repeater Station Blasts ▪ New Instrument Measures Punching Pressure | ||
| Vol. 39, No. 8 | 1961-08-01 | 6.24 MB | ▪ Electronic Memory Devices ▪ Measuring the Sky's Electrical Noise ▪ Portable Ruby Optical Maser Demonstrated by the Laboratories ▪ A New Surface-to-Air Data Communication System ▪ Command Guidance Puts Tiros III in Orbit ▪ The Art of Counting Calls ▪ Nike-Zeus Fired From Underground Cell ▪ Western Electric Awarded UNICOM Contract ▪ A Statistical Ammeter ▪ The Ferrite Isolator: A New Kind of Pad for TJ Radio-Relay ▪ Resistors for Nike-Zeus Made On a Completely Automated Line ▪ Trial Begins on PCM Transmission System ▪ Announcement System Makes New York Debut ▪ | ||
| Vol. 39, No. 9 | 1961-09-01 | 2.33 MB | ▪ Project Echo ▪ The Versatility of TOUCH-TONE Calling ▪ Measurements of Strength Reduction Reveal Wood Decay ▪ Light Amplifiers and Power Sources Discussed at WESCON Meeting ▪ Removing Water From Buried PIC Cable ▪ Blocking Filters for Coaxial Cables ▪ A New Look at Equipment Development ▪ Automation in X-Ray Crystallography ▪ Command Guidance System Directs Explorer XII Into Precise Orbit | ||
| Vol. 39, No. 10 | 1961-10-01 | 2.59 MB | ▪ Around the World By Simulation ▪ Mercury Spacecraft "Proves In" Ground Tracking Network ▪ The Autoatic Card Dialer ▪ Helium and Diffusion Separation ▪ Bell System Data Processing Today ▪ Applications for E6 Repeaters ▪ Displays for Weapons Direction Equipment ▪ Test Equipment for the 82B1 Teletypewriter Switching System ▪ Command Guidance Plays Roles in Titan Hardened-Complex Launch ▪ Solid-State Device Directly Amplifies Ultrasonic Waves | ||
| Vol. 39, No. 11 | 1961-11-01 | 2.80 MB | ▪ The BMEWS Communications System ▪ The Search for New Semiconductors ▪ Optical Maser Symposium at Bell Laboratories ▪ Decentralization: A Feature of Today's Bell Laboratories ▪ Interstitial Channels for the TD-2 System ▪ Concrete for Cable Conduit ▪ Laboratories Scientists, In Japan, Report on Solid-State Research ▪ Radome Takes Shape at Space Center ▪ Data Terminal Equipment Described at A.I.E.E. Meeting | ||
| Vol. 39, No. 12 | 1961-12-01 | 2.36 MB | ▪ The Changing Pattern of Exchange Outside Plant ▪ New Way to Measure Variatios in Rotational Speed ▪ Neutralizing Transformers ▪ Nike-Zeus Scores Successes in Four Test Firings ▪ Central-Office Modifications for TOUCH-TONE Calling ▪ Automated Handling of Pins for B Cable Clips ▪ Computer Simulates Auditorium Acoustics ▪ High Temperature Resonators Made from Electrolyzed Quartz ▪ Silicon Crystals in "Ribbon" Form ▪ New Program to Safeguard Country's Technological Supremacy | ||
| Vol. 40, No. 1 | 1962-01-01 | 8.06 MB | ▪ The Coil-Spring Connector ▪ Nike-Zeus Scores Successes In Development Tests ▪ Accelerated Aging of Semiconductors ▪ Class-of-Service Markings—What and Why ▪ Two New Science Films Produced for Colleges ▪ The TJ Microwave Diversity Switch ▪ Insulation-Piercing Terminal for C Rural Wire ▪ Telstar: Components and Testing ▪ Full-Scale Electronic Central Office Planned for New Jersey | ||
| Vol. 40, No. 2 | 1962-02-01 | 8.34 MB | ▪ Engineering Drawings on Microfilm ▪ The TL Microwave System ▪ Machine Aids to Design ▪ CAMA for Step-by-Step Intertoll ▪ Transistorized Shorts Tester for Electron Tubes ▪ New Military Switching System Goes Into Operation ▪ New Infrared Spectroscopic Technique ▪ Continuous Operation Achieved in Solid-State Optical Maser ▪ Experimental Telephone is Field Tested ▪ Bell System Launches Cable-Laying Ship ▪ Nike-Zeus Destroys Simulated ICBM _ Holmdel Prepares for Project Telstar | ||
| Vol. 40, No. 3 | 1962-03-01 | 9.09 MB | ▪ A Low-Speed Data Set for High-Speed Business ▪ The Structure of Crystals ▪ Unique Acoustic Properties Found in Yttrium Iron Garnet ▪ Laboratory for Ocean Cable ▪ Compatibility in Telephone Communications ▪ Telstar—Satellite Tests ▪ New Low-Noise Parametric Amplifier Operates at 6 kmc ▪ Continuous Operation Achieved in Ruby Optical Maser ▪ Tracking and Communications Network Vital to Glenn's Orbital Flight | ||
| Vol. 40, No. 4 | 1962-04-01 | 8.94 MB | ▪ Search-Radar Tracking In Heavy Seas ▪ An Electronically Scanning Radar Antenna ▪ Soil-Testing Materials and Apparatus ▪ New Handset Will Aid the Hard of Hearing ▪ Human Factors in Transmission Maintenance ▪ AT&T Signs Agreement for Transpacific Cable ▪ Rutgers University and Laboratories to Erect Particle Accelerator ▪ Electronic Switching Control Techniques ▪ Laboratories System Guides NASA Solar Observatory Into Orbit ▪ The B Voltage Tester and Auxiliaries | ||
| Vol. 40, No. 5 | 1962-05-01 | 8.42 MB | ▪ Low-Noise Microwave Amplifiers ▪ TH Microwave Carrier Supply ▪ New Information on Nuclear Fission Fragments ▪ TELSTAR—The Andover Ground Station ▪ Automatic Protection Switching for the TH System ▪ Laboratories Appraises Programmed Learning ▪ Simulation Tests on TELSTAR Antenna ▪ Silicon Solar Cells Measure High Intensity Radiation ▪ Low Cost, High Quality Quartz Grown By New Lithium-Doping Process ▪ AT&T Testifies on Satellite Legislation ▪ Labs System Guides International Satellite ▪ SAC Accepts Operational Titan ▪ Air-Ground Service to Be Extended | ||
| Vol. 40, No. 6 | 1962-06-01 | 9.28 MB | ▪ Thermoelectric Devices and Materials ▪ Symbolic Logic: The Propositional Calculus ▪ Quick-Connect Clip Terminal ▪ Human Factors Engineering and Modern Communications ▪ Mercury Tracking System Aids Carpenter Flight ▪ Testing Equipment for the E6 Repeater ▪ Voice Spectrograms Are Unique Personal Identification ▪ Digital Computer Synthesizes Human Speech ▪ Tantalum-Sputtered Resistors Improved by Adding Nitrogen ▪ New Coin Telephone Set Given Field Trial | ||
| Vol. 40, No. 7 | 1962-07-01 | 9.33 MB | ▪ TWX Goes Dial ▪ Eastern Third of Blast-Resistant Cable System Nears Completion ▪ Symbolic Logic: The Extended Language ▪ Machine Diagnoses its Own Failures: Writes Dictionary for Cures ▪ Growing Oxide Crystals ▪ Telstar Success ▪ New Developments in Gaseous Optical Masers ▪ Packaging and Equipment Design for the E6 Telephone Repeater | ||
| Vol. 40, No. 8 | 1962-09-01 | 8.85 MB | ▪ Bell Laboratories and Project Mercury ▪ The Surfaces of Solids ▪ Epitaxy and Transistor Fabrication ▪ The B Wire Connector for Cable Splicing ▪ The 1A Line Concentrator ▪ Optical Maser Amplifier Announced By Bell Laboratories ▪ New Two-Way Repeater Amplifies 128 Telephone Conversations ▪ Laboratories Develops New Method for Growing Beryl Crystals | ||
| Vol. 40, No. 9 | 1962-10-01 | 8.83 MB | ▪ The Holmdel Laboratories ▪ President Kennedy Signs Satellite Communications Bill ▪ CENTREX Service with No. 5 Crossbar ▪ The Industrial Designer—His Role and Purpose ▪ Simplified EPR Technique Devised ▪ New Synthetic Crystals are Piezoelectric and Fluorescent ▪ Clocks on Two Continents Synchronized by Telstar ▪ For No. 5 Crossbar: A Packaged Central Office ▪ Locating Open Conductors In Multiple-Line Wire ▪ TWX System Successfully Converted to Dial Operation ▪ Two-Way Voice Channel Via Telstar Established with Compact Ground Station | ||
| Vol. 40, No. 10 | 1962-11-01 | 9.07 MB | ▪ The Cape Canaveral Laboratory ▪ The T1 Carrier System ▪ Sintered Circuits ▪ TH Radio Terminals ▪ Canadian "Alouette" Satellite Guided Into Orbit by Command Guidance System ▪ Evolution of Cable-Laying Plows ▪ Centralized Supervisor Facilities ▪ New Surface Analyzer ▪ High-Speed X-Ray Spectrograph ▪ Telstar Provides High-Altitude Radiation Data ▪ Fiber Optics Aids High-Speed Photography ▪ Telstar Relays Tape Schirra's Launch to Europe | ||
| Vol. 40, No. 11 | 1962-12-01 | 9.42 MB | ▪ The Columbus Branch Laboratory ▪ Strain Gages ▪ The Electronic Central Office at Morris, Illinois ▪ Maintaining the ANI System ▪ New Phenomenon Observed in Superconducting Tunnel Diodes ▪ Theuerer Wins Patent for Floating Zone Melting ▪ Miniature Relays for Key Telephone Systems ▪ Bell System Assisting in NASA's Project Relay ▪ Highly-Sensitive Microphone Uses Transistor as Base ▪ Telstar Develops Difficulties in Command Circuit ▪ Princess Phone Gets Own Bell ▪ Gallium Arsenide Diode Used As Low-Temperature Thermometer ▪ Data-Phone Extended to Facsimile Transmission ▪ Advances in Optical Maser Technology Described at NEREM ▪ Laboratories Scientists in Seattle Report on Acoustics Research | ||
| Vol. 41, No. 1 | 1963-01-01 | 7.14 MB | ▪ An FM Data Set for Voiceband Data Transmission ▪ Telstar II to be Launched in Spring ▪ Instrument Evaluation for Missile Application ▪ New Range Charts for PBX Operation ▪ Strain Waves in Crystal Rotated By Magnetic Field ▪ A Missile-Borne Traveling-Wave Tube ▪ Telstar Transmits Transatlantic Pictures Again ▪ Metals Joined to Thermoplastics With Single Layer of Molecules | ||
| Vol. 41, No. 2 | 1963-02-01 | 9.41 MB | ▪ Rubber and Its Use in the Bell System ▪ 101 ESS: A More Flexible Telephone Service for Business ▪ Tantalum Thin-Film Circuitry and Components ▪ SS1 Selective Signaling System ▪ Telstar Reports: High Russian Blasts Cause Surge of Radiation in Space ▪ Position-Independent Mercury Contacts ▪ Science and Engineering Symposium Held at Laboratories | ||
| Vol. 41, No. 3 | 1963-03-01 | 7.69 MB | ▪ NIKE ZEUS ▪ A Microwave Systems Combining Network ▪ High-Gain Optical Maser Developed ▪ Chemical Polishing of Gallium Arsenide ▪ Crystals for Optical Masers ▪ Development Contractor Named For Sprint Missile ▪ The 6A Impulse Counter ▪ Waffle-Iron Construction Promises Compact, High-Speed Memory Device ▪ New Switching Network Developed for Government Agencies ▪ Telstar Fails to Respond to Commands ▪ Large Zinc Oxide Crystals Grown From Seeds ▪ Fastener Study ▪ Transistorized Submarine Cable Planned for 1966 Use ▪ Undersea Cable to Jamaica Completed | ||
| Vol. 41, No. 4 | 1963-04-01 | 15.39 MB | ▪ Project Telstar: Its Aims and Purposes ▪ Design and Construction of the Horn Antenna ▪ The Horn-Antenna Direction System ▪ The Ground Station Transmitter and Receiver ▪ The Satellite Power System ▪ The Satellite Microwave Repeater ▪ Satellite Command and Telemetry System ▪ Thermal Design of the Electronics Canister ▪ Space Hardware Aspects of the Satellite ▪ Launch Operations at Cape Canaveral ▪ Telstar II Satellite Launched |