Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 54
tre to the end, and back again to theother end, several times, being taken off finally at the centre,after each half has been passed over the same number oftimes. The bar is turned over, and the same process repeatedon the opposite face. This is found to give a strong mag-netism to thick bars, but… … Fig. 31. and rubbed backwards and forwards, as in the last-namedmethod. When several bars require to be magnetized atonce, they are placed with their ends in contact, so as toform a closed circuit, the angular spaces between their endsbeing filled in with soft iron. The horse-shoe magnet is putdown…
Electricity
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