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 115
Fig. 47. — Thumb rule for magnetic fieldaround a wire. 92 ELECTRICITY AND MAGNETISM … and in most hardware stores. The compass may be placedunder the wire and the direction toward which its north poleturns noted. Then an application of one of the rules givesthe direction of the current. This means is very commonly used in electrical manufactur-ing establishments and intesting…
Electricity · Magnetism
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