American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 314
due to Robert H. Moris, illustrated in Fig. 204, is somewhat of animprovement on and modification of the Edison Smith duplex just described. It is mod-ified at station A to operate from two separate batteries or dynamo machines d d. Theneutral relay n s. at A is so wound that currents from either… … THE MORRIS DUPLEX. At station B, the coils of the polarized relay pr are connected in series as shown,but are tapped in the middle iu such a manner that when the transmitter tr is closedthe right-hand coil and the rheostat, r, are short circuited, leaving but one coil of therelay in operation. 266…
Telegraph
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