Twentieth century manual of railway and commercial telegraphy (1905)
Meyer, Frederic Louis, b. 1875 · Chicago, New York, Rand, McNally & Company · leaf 29
tical ^in C, fixed in thewooden base. A2 is connected with a metallicspring D, which carries a pin D, against the fixedpin C, and thereby connects the lines Al, A2. Theinsertion of a plug, as shown in the following cut(Fig. 18), by the two pins, causes the movable pin Dto press against the E side… … Fig. 18. Plug Cut-outs. MANUAL OF TELEGRAPHY. 27 terminals Al and A2; and, conseqnently, in theline circuit by the withdrawal of the ping, thespring D snaps against the pin point C and directlyconnects the lines and removes the circuit from therelav. Switch-Board. A BC D r H KL r^ r^ h>^ I…
Telegraph
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