American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 218
the main line. THE STEARNS DUPLEX. 1/9Stearns Terminal connectioxs.—The actual connections and apparatus of aduplex at one station are outlined in Fig. 145. R is a differentially wound relay, each coil having a resistance of about 200ohms. In practice this relay is somewhat larger than the ordinary… … TERMINAL CONNECTIONS, STEARNS DUPLEX. coil which compensates for internal resistance of the main battery b. r is a 3-pointswitch useful in throwing the line to ground when a balance is desired by thedistant end,but it is not so essential in the Stearns duplex as it is in the polar duplex,inasmuch…
Telegraph
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