Twentieth century manual of railway and commercial telegraphy (1905)
Meyer, Frederic Louis, b. 1875 · Chicago, New York, Rand, McNally & Company · leaf 246
ionsare of the pattern shown in Fig. 19, page 27. Asthe current must pass through the office board andinstruments without touching the earth, except atthe terminal points, all wires coming into these waystations, or intermediate peg-boards, are cut andfastened to two separate binding-posts… … METALLICPLUG NO. I NO. 2 Fig. 24, 244 THE TWENTIETH CENTURY The two parallel strips of brass, running verti-cally on the frame of the wooden board, have noconnection with the discs (Fig. 25), which are con-nected to an independent copper strip runninghorizontally across the hack, of the board,…
Telegraph
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