An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 121
staple. The difficulty, in a great majorityof the cases, would never have appeared had wire with good rubberinsulation been used. As No. 18 wire of the Brown and Sharpe gaugeis usually taken for bell circuits, the extra expense caused by usinu:rubber-covered or weatherproof wire is not very great,… … ELECTRO MAGNETISM 99 Battery zincs become used up or the water evaporates, and the batterymay not work on that account. The mechanism of bells and pushbuttons is very simple and not likely to get out of order, but troublemay occur even in them. The contact parts in a push button gradu-ally become…
Electricity · Magnetism
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