Elementary treatise on electricity and magnetism (1903)
Foster, George Carey, 1835-1919, Joubert, Jules François, 1834-1910. Traité élémentaire d'électricité, Porter, Alfred William, 1863- joint author · London, New York, Longmans, Green, and co. · leaf 330
an. 242. Dip Circle.—For the determination of magnetic dip, aneedle that can turn about a horizontal axis, therefore moving in avertical plane, is used : a needle thus arranged moves only underthe action of the component of the earths field which lies in theplane of its motion. Let a be the angle… … Fig. 200. cot i = ■ = cot / cos a. 308 TERRESTRIAL MAGNETISM [242-
Electricity · Magnetism
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