Twentieth century manual of railway and commercial telegraphy (1905)
Meyer, Frederic Louis, b. 1875 · Chicago, New York, Rand, McNally & Company · leaf 249
Fig. 26. 246 THE TWENTIETH CENTUEY The very first row of discs (which are sometimescovered with a metal strip, known as the lightningarrester) is connected to the ground wire, and aninsertion of a metallic ping on either side connectsthat side to the ground, instead of allowing it toliow ont to the… … GROUND INSTRUMENTS INSTRUMENTS CUT OUTS Fig. a?. MANUAL OF TELEGRAPHY. 247 Where a number of wires simply go throughyour board and do not connect to instruments, thatis, are not cut in, the metallic connection is madeat the lower extremities of the vertical strips wherean independent disc, not…
Telegraph
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