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 97
wers, the line current is reversed in direc-tion. This causes the line winding, 60-ohms, to assist the polarizingwinding, 860-ohms, and the differential line relay pulls up. This ener-gizes the auxiliary relay AR which connects the battery feed in parallelwith that of the connector in the distant… … Fig. 72.—Trunk holder with parallel battery feed. When the subscribers release, the failure of current in the line relayLR permits it to fall back and to release the release relay. The latterremoves the ground from the release trunk and depolarizes the differen-tial line relay. If the calling…
Telephone
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