Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 28
Fig. 2.—Natural Magnet. … Fig. 3.—Natural magnet attracting iron nails. 12 ELECTRICAL MACHINERY magnet imparts its property to the piece of iron or steelwitliout any apparent loss of its own. Why this is so will bediscussed when we consider the theory of magnetism later inthis chapter. A magnet that is made by bringing a…
Electric machinery
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