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 129
initely, but always with the same result as indicatedin the figure. This is evidence of the correctness of the molecular theory of magnetism,which states that the molecules of a magnet are themselves minute magnets arranged inrows with their opposite poles in contact. Ques. What is the extent and… … Fig. 108.—The region about a magnet in which its magnetic forces can be detected is calledthe magnetic field. This can be represented graphically by placing a piece of cardboardovei the magnet and sprinkling iron filings on the paper, gently tapping at the same time.Each filing becomes a temporary…
Electrical engineering
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