ch show Something about the Nature of a Magnet.—Take the piece of steel wire, six inches long and direction and their south polcs in the opposite direction, so vibrating the cardboard, by letting fall vertically on it a that the body, as a whole, may obtain and retain its mag- one sixteenth of an… … wire will have north polar- Fia. 24, MAGNETIC CURVES AS SHOWN BY IRON FILINGS. ductively on a cylinder of soft iron, 32 ity, as may be shown by ap- millimeters long and 10 millimeters in plying the wire to the magnet- diameter. In April, 1871, I published in the American Jour- netic polarity.…
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