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 275
1: -STEM … Fig. 3,241.—Elementary alternating current bell with permanent magnet armature. Inconstruction the electromagnets are wound similarly, that is, in the same direction, soas to produce like poles which simultaneously repel and attract the armature ends.The operation is illustrated in figs. 3,242 to…
Electrical engineering
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