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 359
ur-nished with two small concave mirrors with their centres of curva-ture in the plane of the needle. The mirrors thus give in this same plane real and inverted images of g:|^ the points of the needle, and the ^g arm is moved until these reversed images are brought into contact with the points… … Fig. 202. 243] DIP—INTENSITY 337 for which the needle is vertical, and the circle is then turnedthrough 90°. . The two angles / 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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