Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 404
tch to operate and switch the ringing relay out of circuit;but it does not cause the back-bridge relay of the connector switch toreverse the direction of current flow in the calling partys loop for asufficient period of time to operate the meter associated with the callingpartys line switch. It is… … Fig. 299.—Operators circuit, including calling device, for an information or complaint desk. Incoming Complaint Trunks.—These trunks usually terminate at oneend in the banks of selector switches, and at the other end in keys in thecomplaint or information clerks position, and are in every way…
Telephone
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