Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 21
natural, to distinguish them from artificial mag-nets, which are made of tempered steel, magnetised either byrubbing with a natural magnet, or by one of a variety ofmethods described hereafter. These are in the form ofstraight, rectangular or lozenge-shaped bars, or else of barsbent into a… … of a bar magnet, as in the figure, the iron filings remainclinging only to the ends, and to parts very near to the ends.The ends of the bar, in which the magnetic power seemsto be concentrated, are spoken of as the poles of the magnet.The straight line drawn from pole to pole is the axis of…
Electricity
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