American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 211
ence of pressure at one of the terminalsof B might be brought about, for instance, by the use of another pump at the dis-tant end of pipe i, which could, by assisting or opposing the flow of water through,that pipe, vary the pressure at B as desired. Analogously, in the case uf the bridge method,… … THEORY BRIDGE DUPLEX. DUPLEX TELEGRAPHY 173 and a current will flow from the terminal of higher to the terminal of lower pres-sure. If then (as in the case of the differential method) each end of a duplex cir-cuit be equipped with the bridge arrangement, etc., it is clear that the variation…
Telegraph
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