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 69
e relay and battery to the wipers — W + W. It also switchesthe private wiper PW from the test circuit of springs 1-2 of the line relayLR to the private normal and the cut-off relay. The extension of the subscriber lines to the connector causes its linerelay and release relay Rise Ry to ground the… … Fig. 49.—Circuit of rotary lineswitch. Pencil sketch. During conversation the line circuit runs through the lineswitch with-out attachments of any kind. The cut-off relay is the only energizedcoil, drawing its weak current through the motor magnet. Release is accomplished by removing ground from…
Telephone
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