Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 277
ion. Ans. In fig. 3,245, the effect of the permanent magnet is tomagnetize the magnet cores of the electromagnet and the 2,368 HAWKINS ELECTRICITY armature by magnetic induction. Thus, the N pole of the per-manent magnet induces south polarity 5 at the middle part ofthe yoke and north polarity n, n… … Fig. 3,245.—Elementary alternating current bell polarized by magnetic induction. Theletters N and S represenc the permanent magnet poles, and the italics n and 5 the polesinduced by the permanent magnet. The kind of current on which the bell will worksatisfactorily is suggested by the elementary…
Electrical engineering
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