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 521
them,experiment shows that the lineof the biushes must be displacedin the direrfion of the motion. A position, ab (Fig. 338), varyingwith the strength of the current, is thus found, for which the sparksare totally suppressed, or at all events, reduced to a minimum.The angle which the line ab of the… … 426] DISPLACEMENT OF BRUSHES 499 will turn in the opposite direction, but the position of the brushesfor which sparking ceases is still, as before, the position ab ;accordingly, the diameter of contact must be turned through thesame angle, but in the direction opposite to the motion. Let us…
Electricity · Magnetism
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