Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 53
is repeated five or sixtimes on both sides of the bar to be /vmagnetized, and gives a fairly strongmagnetism to a short thin bar, such as a piece of watch-springor small compass needle. The arrow shows the direction inwhich the bar is rubbed across the pole to communicate thepoles shown by the… … N S Pig. 20. N S While under their induction the bar is stroked, each halfwith the pole of another magnet of the same name as thecorresponding inducing pole, the stroking magnets being heldin the hands at an angle of about 30 degrees with thebar; the stroking beginning from the centre of the bar,…
Electricity
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