Inside Out Library
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 209
Fig. 180.—Direction of CurrentAround Horseshoe Magnet. … 8. Called a Paradox.The rounded end hasgreatest tractive power. 12. Varl«y Duplex Mag-net.Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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