Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 426
elays A and B will not be ener-gized because the circuit through them is not completed to groundat the ring of the jack. Under this circumstance the current foroperating the subscribers transmitters, and for operating the super-visory signals is drawn from the battery bridged across the cord… … FIG. 307.-CONNECTION, PRIVATE BRANCH TO CITY SUBSCRIBER-WESTERN ELECTRIC SYSTEM.404 PRIVATE BRANCH EXCHANGE SERVICE. 405 is completed to ground through the ring contact of the trunk jack.In this case the battery and repeating coil are automatically cut out,and the private branch subscriber draws…
Telephone
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