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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 30

An illustration from Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book, 1902, leaf 30
Fig. 16.—HorseshoeMagnet and Keeper.

Electricity · Magnetism

Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.

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