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
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… … Fig. 109.—Tracing lines of force with a suspended magnet. If a small magnetic needle, sus-pended by a thread, be held near a magnet, it will point in some fixed direction dependingon the proximity of the poles of the magnet. The direction taken by the magnet is calledthe direction of the force at…
Electrical engineering
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