Small, Sidney Aylmer, 1876- [from old catalog] · Chicago, F. J. Drake & co · leaf 169
is. The part of the iron under thenorth pole of the magnet becomes a south pole. It may be difficult to find a piece of iron which is notslightly magnetized. 170 ELEMENTARY ELECTRICITY Question 16. How can you demagnetize? Answer. Heat to a cherry red and cool very, slowly.The piece may be now… … y—~xyw?Z—7 Iron Filmy* Fig. 82. The Induction of Magnetism in Iron without Contact. tach another until three or four are adhering to the mag-net. The end of the first nail which is in contact withthe north pole of the magnet becomes a south pole byinduction. This temporary polarity of the first…
Electricity
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