Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 366
nds of the answering and calling plugs,respectively, the points of connection between these two relays andtheir respective tip strands being separated by a two-microfarad con-denser. The relay, C, is connected between the negative side ofthe battery and the sleeve strand of both the calling and… … FIG. 279.-INTERNATIONAL MULTIPLE SWItCH-EOARD CIRCUIT. 344 THE COMMON BATTERY MULTIPLE SWITCH-BOARD. 345 the battery and both supervisory lamps, t°his contact being nor-mally open, but closed upon the operation of the relay. When the answering plug is inserted into the jack of a callingsubscriber…
Telephone
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