Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 349
o originated the call hangs uphis receiver. In other words, the pilot lamp will light whenever thesubscriber to whose line the answering plug is connected hangs uphis receiver. The night alarm bell will also sound if the switch con-trolling it is in the proper position. This is readily accomplished… … MULTOACRS. SUBS,STATIOM FIG. 271.—STROMBERG-CAELSON TWO-WIRE MULTIPLE SWITCH-BOARD LINE CIRCUIT. to the circuits of all the answering supervisory lamps on thatposition. In a common portion of the circuit belonging to all of the super-visory pilot lamps in the office is placed a night alarm pilot…
Telephone
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