Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 364
elay coils, and this relayis, of course, energized. Like the line relay, it remains energized aslong as the subscribers receiver is removed from its hook. Theconditions so far described are exactly reprbduced with respect tothe calling plug and the line called for, and therefore, when a con-nection… … [« r^^r^ FIG. 27S.—SIMPLIFIED NORTH CIRCUIT. relay belonging to that line and the supervisory relay of the an-swering plug. Similarly, the current is supplied from battery, B,to the line of the called subscriber through the coils of the linerelay belonging to that line and the supervisory relay of…
Telephone
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