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 465
Fig. 304. 442 GALVANOMETERS [360- … The effect of tlie earth may be compensated by that of a magnetwhich produces in the place occupied by the needle a sensibly uni-form field in the opposite direction to that ofthe earth. This magnet, which is called thecompensating or adjusting magnet, is usuallysupported on a rod (Fig. 305), to…
Electricity · Magnetism
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