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 130
Fig. 111.—Magnetic action: Like poles of magnets repel each other. MAGNETISM 111 Magnetic Force.—This is the force with which a magnetattracts or repels another magnet or any piece of iron or steel.The force varies with the distance, being greater when the mag-net is nearer and. less when the…
Electrical engineering
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