Modern electricity and magnetism, theoretically and practically considered (1885)
Avery, Elroy M[cKendree], 1844- [from old catalog] · New York and Chicago, Sheldon and company · leaf 148
an any permanent magnet but loses its power as soon as the currentceases to flow through its coil.The fact that the magnetism ofthis apparatus is under controladapts it to many important uses,such as electric bells and tele-graphic instruments. 443. Forms of Electro-Magnets.—The bar of § 416, a,^^… … 318 MAGNETISM, body at the same time. The middle of the bent bar isbare^ the direction of the windings on the ends being suchthat^ were the bar straightened^ the current would movein the same direction round every part. More frequently,the two helices, A and B, have separate cores which arejoined…
Electricity · Magnetism
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