Electricity simplified. The practice and theory of electricity .. (1891)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · New York, N. W. Henley & co. · leaf 87
nergy. This distinction is important andtoo little appreciated. A magnet holding its arma-ture attracted does no work. When a bar of iron is wound with wire, insulated 86 ELECTRICITY SIMPLIFIED. or otherwise prevented from touching the iron andwith its spirals not touching each other, the iron… … v^j^m. y Fig. 19.—Electro-Magnet Developing Lines of force. the indications of possessing magnetism or of beingpolarized. If instead of iron a piece of steel is taken andtreated thus, the effects are the same in general, ex-cept that a large portion of the imparted magnetismis permanent, and…
Electricity
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