Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 487
short coils, eachattached to its own pair of bars. By this means the strengthof the current is made more nearly uniform, as appears in Fig. 306. 476 INDUCTION OF CURRENTS. 428. Ring Armature. — The first form of machine to givea continuous current on a considerable scale was invented byPaciflbtti… … pendently invented by Gramme in 1870. whence his name isoften associated with this type of armature, which is showndiagrammatic ally in Fig. 307. Suppose the ring is revolving in the direction of the arrow,then, applying Maxwells rule to any single turn of wire, as ah, since the induction…
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