American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 307
. opens the call bell circuit and throws his own sounder, s, and key, into cireuit,by meansof which he then communicates with the branch office. This arruuoomeut has the ad- 258 AMERICAN TELEGRAPHY. vantage, if such it may be considered, that none but the main office can hear the re-marks of the… … MO i BO IlIIIHh JBO CHICAGO BRANCH OFFICE SIGNALING CIRCUIT. a relay into each circuit at regular intervals to listen to the working of the wire, therebyto anticipate a complaint or call on the part of the branch office or lessee. In addition to the foregoing measure to insure j^romptness in the…
Telegraph
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