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
R which connects the current supply througha double-wound impedance coil. When the trunk is seized, the line relay LR energizes the release relay 80 A U TOM A TIC TELEPHON Y RlRy which grounds the release trunk and polarizes the differentialline relay DLR. During the sending of impulses over the… … LRofIncoming-1 Selector Fig. 71.—Trunk holder. When the called station answers, 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…
Telephone
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