VOLUME II

MANUAL SWITCHBOARDS _By K. B. Miller and S. G. McMeen_[A] Page[B] 11

Common-Battery Switchboards--Line Signals--Cord Circuit--Lamps--Mechanical Signals--Relays--Jacks--Switchboard Assembly--Transfer Switchboard--Transfer Lines--Handling Transfers--Multiple Switchboard--Busy Test--Influence of Traffic--Magneto-Multiple Switchboard--Multiple Boards: Series, Branch-Terminal, Modern Magneto, Common-Battery--Western Electric No. 1 Relay Board--Western Electric No. 10 Board--Types of Multiple Boards--Apparatus--Trunking--Western Electric and Kellogg Trunk Circuits

AUTOMATIC SYSTEMS _By K. B. Miller and S. G. McMeen_ Page 135

Automatic vs. Manual--Operation--Selecting Switch--Line Switch--Trunking Systems--Two- and Three-Wire Systems--Subscriber's Station Apparatus--First and Second Selector Operation--Connector--Release after Conversation--Multi-Office System--Automatic Sub-Offices--Rotary Connector--Party Lines--Two-Wire Automatic System--Lorimer System--Central-Office Apparatus--Operation--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

Currents Employed--Types--Operator's Transmitter Supply--Ringing-Current Supply--Auxiliary Signaling Current--Primary Sources--Duplicate Apparatus--Storage Batteries--Power Switchboards--Circuits--Central-Office Building--Arrangement of Apparatus--Manual Offices--Automatic Offices

SPECIAL SERVICE FEATURES _By K. B. Miller and S. G. McMeen_ Page 271

Private-Branch Exchanges--Switchboards--Supervision--With Automatic Offices--Battery Supply--Ringing Current--Inter-Communicating Systems--Magneto System--Common-Battery Systems--Types--Long-Distance Switching--Operator's Orders--Trunking--Way Stations--Traffic--Measured Service--Charging--Rates--Toll Service--Local Service

TELEGRAPH AND RAILWAY WORK _By K. B. Miller and S. G. McMeen_ Page 321

Phantom, Simplex, and Composite Circuits--Ringing--Railway Composite--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

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

[Footnote B: For page numbers, see foot of pages.]