Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 81
bodies.A certain native oxide ofiron is called magnetite,because pieces of it (lode-stones or leading stones)sometimes are naturalmagnets. Such a natu-ral magnet changes aFlG- 20- magnetic piece of soft steel or iron to an artificial magnet, without losing any partof its own magnetism. The steel… … ELECTRICAL ENGINEERING g^ the name. It is occasionally found in Sweden, Spain, Arkansasand the Isle of Elba. A horseshoe magnet (see fig. 20) is a steel bar magnet,the two ends of which are bent close together. The advantageof a horseshoe magnet lies in the fact that a piece of soft ironplaced…
Electrical engineering
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