A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 174
rom one side, a direction through the circuit awayfrom the observer. Directive Tendency of Magnetic Needle.■—(See Needle, Magnetic, Directive Ten-dency of)Disc, Ara^os A disc of copper or other non-magnetic metallic substance,which, when rapidly rotated under a mag-netic needle, supported… … Fig. 203. Arago s Disc. ment of the needle is due to electric currents, in-1duced by the disc moving through the field of theneedle so as to cut its lines of magnetic force. Toobtain the best results the disc must move veryrapidly, and should be near the needle. More-over, the needle should be…
Electricity · Electrical engineering
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