American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 334
coil, due to the transmission of signals, while not sufficient to allow the relayto return to its normal zero between signals, being, yet, sufficient to actuate the point-er, and thus to operate the local sounder, at a fair rate of speed. The Jacobs Duplex, Submarine cables of moderate length, such… … C
Telegraph
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