| 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 | Missing pp. 146-147 | |
| 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 | p. 51 blurry | |
| 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 | Missing pp. 20-21 | |
| 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 | Missing pp. 74-75 | |
| 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 | Missing pp. 68-69 | |
| 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 | Missing pp. 238-239 | |
| 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 | Missing pp. 136-137 | |
| 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 | Missing pp. 58-59 | |
| 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 | Missing pp. 128-129 | |
| 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 | Missing pp. 361-362 | |
| 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 | Missing pp. 12-15 | |
| 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 | Missing pp. 210-211 | |
| 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 | pp. 132-133, 136-137, 140-141 missing | |
| 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 | pp. 48-49 missing | |
| 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 | pp. 82-83 missing | |
| 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 | pp. 118-119 missing | |
| 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 | pp. 140-141, 165-166 missing | |
| 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 | pp. 180-181, 204-205, 224-225 missing | |
| 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 | pp. 248-249 missing |