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 78
relay falls back and energizes the rotaryrelay before the release relay has time to let go. Then the release relayfalls back, so that for a brief time there is no ground on the release trunk.Yet the release-magnet circuit of the connector is open, being held soby the back-bridge relay. Then the… … Line CalledTelephone 2MEFig. 61.—Talking conditions in single-office exchange. When the called subscriber hangs up, the back-bridge relay closesthe release-magnet circuit and takes the locking ground off the ring cut-off relay and the wiper-closing relay. The release of the connector pro-ceeds as…
Telephone
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