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 331
he arm is fur-nished with two small concavemirrors with their centres of curva-ture in the plane of the needle.The mirrors thus give in this sameplane real and inverted images -of ,:the points of the needle, and the!arm is moved until these reversedimages are brought into contactwith the points… … Fig. 202. 243] DIP—INTENSITY 309 for which the needle is vertical, and the circle is then turnedthrough 90°. The two angles i and i, which correspond to two positions ofthe circle at right angles to each other, are also often determined.As we have seen above, the sum of the squares of the…
Electricity · Magnetism
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