American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 334
C … \^ JACOBS DUPLEX. operated separately, marked inductive effects from wire to wire might be expect-ed, especially in view of the sensitiveness of the receivhig instruments necessarilyemployed. To avoid these effects and yet retain the practical equivalent of two con-ductors, an arrangement known as…
Telegraph
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