Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 376
Fig. 236. (B) with soft iron armatures. The varying strength of thecurrent in the coils alters the magnetism of the cores, and 358 Electricity. [Book in. causes vibration in the plate of thin sheet-iron, which isadjusted so as to be all but in contact with them. The plateis held in the outside case…
Electricity
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