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Electricity treated experimentally (1887)
Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 376
Fig. 235. The inside is shown (Fig. 236, b), in which A is a strongpermanent magnet, over whose poles are two coils of wireElectricity
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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