Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 93
er-ated. Thus messages being transmitted in opposite direc- 78 TELEGRAPH ENGINEERING tions over a single wire are simultaneously repeated withoutinterference. Fig. 20 shows the connections of the direct-point duplexrepeater used by the Postal Telegraph-Cable Company.The principle of operation is… … Fig. 20. resistances r, r (shunted by i-mf. condensers) are bridgedfrom ground to the armatures of the repeater relays Piand P2. The transmission of signals from one station tothe other through the repeater for the various positions ofthe keys can readily be traced, the pole-changers C and…
Telegraph
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