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 585
h great difficulty. When an alternatingelectromotive force is applied the current flows only duringhalf the time, and solely in one direction, provided that themaximum electromotive force lies within a certain range. 444. Voltaic Arc.—Davy having attached two rods of carbonto the poles of a battery… … The phenomenon is so brilliant that it can only be looked atthrough a dark glass; a still more convenient way of observing itis to project the image of the arc and thetwo caibons on a screen by means of alens. It is then seen that the arc hasfar less brilliance than the points of thecarbons…
Electricity · Magnetism
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