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 447
compass-needles andgalvanometer-needles. The forces called into play act as though there were a frictionalresistance to the relative motion of the needle and the conductor,the effect at each instant being proportional to the strength of thecurrent and to the relative velocity. 326. Foucault… … FlG. 276. ment in a very striking form. By means of a system of toothedwheels worked by a handle, a stout disc of pure copper, d, ismade to rotate between the branches, ab, of a powerful electro-magnet (Fig. 276). As soon as the current passes, a considerable effort is requiredto keep up the motion…
Electricity · Magnetism
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