Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 39
Fig. 15. with the latter company. The generators for the two highervoltages are generally duplicated so as to permit of re-versal of potential, as necessary in duplex and quadruplexservice (see Chapters II and III). With printing tele-graph systems no volts are generally used. … Fig. 16. The arrangement of generators at a telegraph office isshown in Fig. 15, the voltages indicated being those of thePostal Telegraph-Cable Company. Protective resistances,r, in series with each telegraph line, are used to prevent in-jury to the machines in case of short-circuits, etc. Fig. 16…
Telegraph
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