Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 306
uments Res in the fact that i/s mngnet-ism is under the control of the acrrentj when circuit is made ^ it becomes a magnet, when circuit is *^ broken it ceases to act as a magnet. Many special forms of electromagnet have been de-vised for special purposes. To give a very powerfulattraction at very… … :hap. v.] electricity AND MAGNETISM. 1289 329), having a long movable iron core is used. Forgiving a very quick-acting magnet the coils should notbe wound all along the iron, but only round the poles.As a rule the iron parts, including the yoke and arma-
Electricity · Magnetism
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