American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 567
he multiple break-wheel circuit is opened, all of the main line cir-cuits will be similarly opened, in the usual manner, by the operation of the armaturelever of m. The numbers shown on the rear of the repeater case, Fig. 342, represent the num-bers of the street boxes. The act of placing the index… … MANUAL REPEATING TRANSMITTER GAYNOR. The knobs at the right control circuits communicating with the various officers ofthe Fire department. Jersey City or Speicher Fire Alarm Telegraph System. Where tower bells are struck to announce fire alarms, unless the speed of thegearing of the signal boxes…
Telegraph
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