History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 302
able to the tongue;if there is a leak in the cable, a strong or weak current willbe found, according to the size of the leak and the strength of thebattery. A pocket magnet (Fig. 84) is a very convenient instrumentfor the purpose of testing upon a line, as you can converse withthe operators, when… … Repairing the wire when broken is a veiy simple affair. Ifbroken between two poles, a piece of wire is joined to the longerpart sufficient to reach to the next pole. The repairer then putson his creepers or spurs and mounts the pole, taking the wire inhis hand. When arrived at the top, he draws,…
Telegraph
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