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 292
relay #-28. In order to guard the connector switch from being seized in case thecalling subscriber should release before the called subscriber hangs up,the tip relay #-25 places a ground upon the release trunk which terminates AUTOMANUAL SYSTEM 269 in contacts C-200 on the banks of the second… … Fi<;. 230.-—Rinsing conditions. During conversation the existing circuits are as shown in Fig. 231.The calling subscriber draws current through two relays in the primaryselector. The called subscriber is supplied with current from two relaysin the connector. The cut-off relay of each line is…
Telephone
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