Table of Contents

VOLUME I


FUNDAMENTAL PRINCIPLES _By K. B. Miller and S. G. McMeen_[A]

Acoustics--Characteristics of Sound--Loudness--Pitch--Vibration of
Diaphragms--Timbre--Human Voice--Human Ear--Speech--Magneto
Telephones--Loose-Contact Principle--Induction Coils--Simple Telephone
Circuit--Capacity--Telephone Currents--Audible and Visible
Signals--Telephone Lines--Conductors--Inductance--Insulation


SUBSTATION EQUIPMENT _By K. B. Miller and S. G. McMeen_

Transmitters--Variable Resistance--Materials--Single and Multiple
Electrodes--Solid-Back Transmitter--Types of
Transmitters--Electrodes--Packing--Acousticon Transmitter--Switchboard
Transmitter--Receivers--Types of Receivers--Operator's
Receiver--Primary Cells--Series and Multiple Connections--Types of
Primary Cells--Magneto Signaling Apparatus--Battery Bell--Magneto
Bell--Magneto Generator--Armature--Automatic Shunt--Polarized
Ringer--Hook Switch--Electromagnets--Impedance, Induction, and
Repeating Coils--Non-Inductive Resistance
Devices--Differentially-Wound Unit--Condensers--Materials--Current
Supply to Transmitters--Local Battery--Common Battery--Diagrams of
Common-Battery Systems--Telephone Sets: Magneto, Series and Bridging,