File:American telephone practice (1905) (14733332656).jpg

Identifier: americantelepho00mill (find matches)
Title: American telephone practice
Year: 1905 (1900s)
Authors: Miller, Kempster B. (from old catalog)
Subjects:
Publisher:
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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toll-switching operator having made the connection be-tween the multiple board end of the trunk and the subscribers line. If, on the other hand, the toll operator finds that the trunk lineis designated on the ticket, she will know that the recording oper-ator has already ordered up the connection, and that the subscriberis waiting. Under this circumstance she will first insert the an-swering plug into the trunk of the jack designated on the toll ticket.This act will light the disconnect lamp in the cord circuit of therecording operator. The lighting of this lamp will be the signalfor the recording operator to pull down the connection at her posi-tion. The toll operator will then make the connection between thejack of the trunk line used and the toll line and call the toll sta-tion by ringing. Connection is now established between the tollstation and the common battery subscriber. The wiring of all thecircuits over which conversation takes place is shown in Fig. 356. M-VOLT5 ^ <■
Text Appearing After Image:
^=^^3 FIG. 356.-COMPLETE WESTERN ELECTRIC TOLL CIRCUIT, SYSTEM C. 506 TOLL SWITCH-BOARD SYSTEMS. 507 The toll-trunk circuit shown in this figure shows it in the formwhich was patented, but differs in one or two respects from the cir-cuit which the Bell companies are now using. Relay E has beenreplaced by one of a different type, but the method of operation,as described above, has not been changed. When the trunk plug was inserted by the toll-switching operatorinto the multiple jack of the calling subscribers line in responseto the order received from the toll-recording operator or from thetoll operator, the relay A at the toll switching position was ener-gized. This severed the normally completed test circuit belongingto the trunk plug and completed the circuit from the tip of the plugto the tip side of the trunk line. The operation of this relay alsoclosed a circuit from the grounded side of battery at the toll boardthrough the upper contact of relay H over the trunk line to thecommo

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