Elementary treatise on electricity and magnetism : founded on Joubert's "Traité élémentaire d'électricité" (1909)
Foster, G. Carey (George Carey), Porter, Alfred William, 1863-1939, Joubert, Jules François · London : Longmans · leaf 358
n. 242. Dip Circle.—For the determination of magnetic dip, aneedle that can turn about a horizontal axis, therefore movintr 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… … F]G. 200. cot i ■■ Z = cot / COS a. 56 TERRESTRIAL MAGNETISM [242- If a = - we £fet cot i = 0, 2 *
Electricity · Magnetism
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