Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 371
de-pends, Take a narrow bobbin (Fig. 231) of thin wire, and placeit round the pole of a bar magnet, supported horizontally, in-cluding a sensitive galvanometer in the circuit. On takinga piece of thin plate iron, 2 or 3 inches in diameter, andmoving it towards the pole, we have an induced current… … Fig. 231 becomes a magnet under the induction of the permanentmagnet, and on moving it towards the permanent magnet itacts inductively upon it, altering its magnetism, and there-fore causing an induced current. Eemove now the galvanometer, and replace it by a similarmagnet, also surrounded near one…
Electricity
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