CHAPTER I—Acoustics—Characteristics of Sound—Loudness—Pitch—Vibration of Diaphragms—Timbre—Human Voice—Human Ear

            CHAPTER II—Speech—Magneto Telephones—Loose-Contact Principle—Induction Coils

            CHAPTER III—Simple Telephone Circuit—Capacity—Telephone Currents—Audible and Visible Signals

            CHAPTER IV—Telephone Lines—Conductors—Inductance—Insulation

            Substation Equipment By K. B. Miller and S. G. McMeen 

            CHAPTER V—Transmitters—Variable Resistance—Materials—Single and Multiple Electrodes—Solid-Back Transmitter—Types of Transmitters—Electrodes—Packing—Acousticon Transmitter—Switchboard Transmitter

            CHAPTER VI—Receivers—Types of Receivers—Operator's Receiver

            CHAPTER VII—Primary Cells—Series and Multiple Connections—Types of Primary Cells

            CHAPTER VIII—Magneto Signaling Apparatus—Battery Bell—Magneto Bell—Magneto Generator—Armature—Automatic Shunt—Polarized Ringer

            CHAPTER IX—Hook Switch

            CHAPTER X—Electromagnets—Impedance, Induction, and Repeating Coils

            CHAPTER XI—Non-Inductive Resistance Devices—Differentially-Wound Unit

            CHAPTER XII—Condensers—Materials

            CHAPTER XIII—Current Supply to Transmitters—Local Battery—Common Battery—Diagrams of Common-Battery Systems

            CHAPTER XIV—Telephone Sets: Magneto, Series and Bridging, Common-Battery

            Party-Line Systems By K. B. Miller and S. G. McMeen 

            CHAPTER XV—Non-Selective Party-Line Systems—Series and Bridging—Signal Code

            CHAPTER XVI—Selective Party-Line Systems: Polarity, Harmonic, Step-by-Step, and Broken-Line

            CHAPTER XVII—Lock-Out Party-Line Systems: Poole, Step-by-Step, and Broken-Line

            Protection By K. B. Miller and S. G. McMeen 

            CHAPTER XVII—Electrical Hazards

            CHAPTER XIX—High Potentials—Air-Gap Arrester—Discharge across Gaps—Types of Arrester—Vacuum Arrester—Strong Currents—Fuses—Sneak Currents—Line Protection—Central-Office and Subscribers' Station Protectors—City Exchange Requirements—Electrolysis

            Manual Switchboards By K. B. Miller and S. G. McMeen 

            CHAPTER XX—The Telephone Exchange—Subscribers', Trunk, and Toll Lines—Districts—Switchboards

            CHAPTER XXI—Simple Magneto Switchboard—Operation—Commercial Types of Drops and Jacks—Manual vs. Automatic Restoration—Switchboard Plugs and Cords—Ringing and Listening Keys—Operator's Telephone Equipment—Circuits of Complete Switchboard—Night-Alarm Circuits—Grounded and Metallic Circuit Line—Cord Circuit—Switchboard Assembly

            Review Questions 

            Index 

            [A] For professional standing of authors, see list of Authors and Collaborators at front of volume.