Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 742
moved into its thirdposition, the coil of the ringing relay was brought into the localcircuit of the vertical relay of the connector. Pressing the ringingbutton at the calling sub-station at this time therefore causes theenergization of the ringing relay. These circuits are most clearlyshown in… … AUTOMATIC SWITCH-BOARD SYSTEMS. 721 called subscribers line and the calling generator, G. The bell ofthe called subscriber is thus rung, and when he responds the con-versation ensues over the circuit shown in the lower diagram ofFig. 513- No mention has yet been made of the back signal relay, B S…
Telephone
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