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 128
gnet h held undera piece of card board upon which iron filings are sprinkled, thefilings will arrange themselves in curved lines radiating from thepoles. If a horse shoe magnet be held at right angles to theplane of the card board, the filings will arrange themselvesin curved lines, as shown in… … Fig. 100.—Badly magnetized bar. Properly magnetized magnets have only two poles; it ispossible, however, by special or careless magnetization, to produce magnets with morethan two poles, but no process will produce a magnet with a single pole. If an abnormalmagnet with more than two poles be dipped…
Electrical engineering
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