A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 261
ght aluminiumindex, moving over a graduated scale. A mova-ble, semi-circular magnet B, called the restoringmagnet, is placed over the needle, and is usedfor varying the effect of the earths field at anypoint. The sensitiveness of the instrument maybe varied either by the restoring magnet or… … Fig. 280. Galvanometer Voltmeter. tween any two points in a circuit, the current thatpasses through it, and hence the deflection of itsneedle, is directly proportional to the differenceof potential between such two points. tial.] 252 [Gas. Galvanometers for the commercial measure-ments of currents…
Electricity · Electrical engineering
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