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Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 38
^^mmmmx . :,, 2 , ._ Fig. 29.—Two Parallel Bar Magnets, L … Ijacent. \ \ ! / s -m- rrr 1 Fig. 30.—Note-book Sketch of Fig. 26.Electricity · Magnetism
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