tag="{http://www.w3.org/1999/xhtml}a">CHAPTER XXX—Lorimer System—Central-Office Apparatus—Operation

CHAPTER XXXI—Automanual System—Operation—Subscriber's Apparatus—Operator's Equipment—Switching Equipment—Distribution of Calls—Connection—Speed

Power Plants and Buildings By K. B. Miller and S. G. McMeen Page 227

CHAPTER XXXII—Currents Employed—Types—Operator's Transmitter Supply—Ringing-Current Supply—Auxiliary Signaling Current—Primary Sources—Duplicate Apparatus—Storage Batteries—Power Switchboards—Circuits

CHAPTER XXXIII—Central-Office Building—Arrangement of Apparatus—Manual Offices—Automatic Offices

Special Service Features By K. B. Miller and S. G. McMeen Page 271

CHAPTER XXXIV—Private-Branch Exchanges—Switchboards—Supervision—With Automatic Offices—Battery Supply—Ringing Current

CHAPTER XXXV—Inter-Communicating Systems—Magneto System—Common-Battery Systems—Types

CHAPTER XXXVI—Long-Distance Switching—Operator's Orders—Trunking—Way Stations

CHAPTER XXXVII—Traffic

CHAPTER XXXVIII—Measured Service—Charging—Rates—Toll Service—Local Service

Telegraph and Railway Work By K. B. Miller and S. G. McMeen Page 321

CHAPTER XXXIX—Phantom, Simplex, and Composite Circuits—Ringing—Railway Composite

CHAPTER XL—Telephone Train Dispatching—Railroad Conditions—Transmitting Orders—Apparatus—Telephone Equipment—Types of Circuits—Test Boards—Blocking Sets—Dispatching on Electric Railways

Review Questions Page 359

Index Page 373

List of Plates

GROSSE POINT EXCHANGE RACK
Detroit Home Telephone Company, Detroit, Mich.
The Dean Electric Co.

LINE SIDE OF LARGE MAIN DISTRIBUTING FRAME

PORTION OF TERMINAL ROOM OF LARGE COMMON-BATTERY OFFICE
Prospect Office, New York Telephone Co.

TERMINAL ROOM APPARATUS IN PROCESS OF INSTALLATION
Installed by Dean Electric Company at Detroit, Mich.

CABLE TURNING SECTIONS, BETWEEN A AND B BOARDS
Cortlandt Office, New York Telephone Co.

CABLE RUN FROM INTERMEDIATE FRAME TO MULTIPLE
Cortlandt Office, New York Telephone Co.

TERMINAL ROOM IN MEDIUM-SIZED MANUAL OFFICE
Relay Rack at Right. This Employs the Kellogg Parallel Arrangement of Frames.

SWITCH ROOM OF CITIZENS' TELEPHONE COMPANY, GRAND RAPIDS, MICH.
One of the Earliest Large Automatic Offices.

A MULTIPLE MANUAL SWITCHING BOARD FOR TOLL CONNECTIONS IN AN AUTOMATIC SYSTEM
Multiple Jacks are Provided for Each Line through Which Toll Connections are Handled Directly.

AUTOMATIC EQUIPMENT, MAIN OFFICE, BERKELEY, CALIFORNIA
A Feature of Interest Here is That the Cement Floor is Treated with a Filler and Painted, with No Other Covering.

WESTERN ELECTRIC COMPANY TYPICAL CHARGING OUTFIT AT DAWSON, GEORGIA

DEAN HARMONIC CONVERTER
Dry Cell Type for Magneto Exchange.
The Dean Electric Co.

POWER SWITCHBOARD FOR MEDIUM-SIZED OFFICE
Mercury Arc Rectifier Panel and Transformer at Right.

GAS ENGINE AND POWER BOARD
Citizens' Telephone Co., Racine, Wis.
The Dean Electric Co.

POWER MACHINERY
Citizens' Telephone Company, Racine, Wis.
The Dean Electric Co.

POWER APPARATUS FOR COMMON-BATTERY MANUAL OFFICE OF MEDIUM SIZE

THE POWER AND WIRE CHIEF'S ROOM OF THE EXCHANGE AT WEBB CITY, MISSOURI

RINGING AND CHARGING MACHINES AND POWER BOARD
Plaza Office, New York Telephone Co.

POWER PLANT FOR AUTOMATIC SWITCHBOARD EQUIPMENT
Bay Cities Home Telephone Company, Berkeley, Cal.

WESTERN ELECTRIC COMPANY BATTERY ROOM AT MONMOUTH, ILLINOIS

WESTERN ELECTRIC MOTOR-GENERATOR CHARGING SET

WESTERN ELECTRIC RINGING MACHINE

FRONT OF