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Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples (1911)
Moreton, David Penn, 1882- · Chicago, The Reilly & Britton co · leaf 98
n that the N-pole is toward theleft and the S-pole is toward the right. If the compass needlebe placed above the conductor, as shown in Fig. 57, the N-pole will point toward the right and the S-pole toward the e N<- -^N Fig. 56 © Fig. 57 left. When the current is reversed in direction, that is,… … Fig. 58 If a conductor is passed through a small opening in thecenter of a piece of cardboard that is supported in a hori-zontal position, as shown in Fig. 58, and a current is passedthrough the conductor, the field may be explored by meansof a small compass needle. When the current in the con- 88…Electrical engineering
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