American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 358
WHEATSTONE AUTOMATIC TELEGRAPH. 305 the ends of the screws s s in adjusting, and an unnecessarily extended motion of thearmature, with a probable reduction in the speed of reception of signals. WHEATSTONE DUPLEX. The Wheatstone automatic system in this country is almost invariably worked onthe… … TERMINAL CONNECTIONS WHEATSTONE DUPLEX-THEORY switch attached to the frame of the transmitter, used to change from the automaticto the manual system, in which latter case an ordinary pole-changer pc, operatedby a key, k, is employed. When the switch is turned to the left, as at present,…
Telegraph
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