Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 53
with thebar; the stroking beginning from the centre of the bar, andthe poles being lifted at the ends, in an arch, back againto the centre. The stroking is repeated on the oppositeface of the bar. This method gives a strong and evenmagnetism to moderately thin and long bars. 23. Method of Double… … Fig. 30. the centre of the bar to be magnetized, but separated bya small piece of wood. The stroking magnets, held at anangle of about 15 degrees to the bar, are drawn along the bar Cbap. hi.] Methods of Magnetization. 35 steadily from the centre to the end, and back again to theother end, several…
Electricity
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