Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 96
theleft and right sides as A and B. This apparatus is usually-interconnected at a switchboard by means of flexibledouble-conductor cords equipped with plugs or wedgeswhich fit into appropriate jacks, these cords being repre-sented, for the sake of simplicity, by dotted Hnes. The operation of the… … Fig. 22. ential holding coil H of the Weiny-PhilHps relay has beenexplained in § lo of Chap. I. In the normal condition, when the distant keys on bothlines are depressed (or circuit-closers closed) current flowsover the simplex line, distant relay and relays R and Rijand the duplex line will be in…
Telegraph
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