An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 145
north-seek-ing {N) pole and the other, thes<> nth-seeking (S) pole. 87. How to make a magnet.First the steel must be hardened.To do this, heat to brilliant redand then quickly plunge into coldwater, oil, or mercury. The steel then becomes intensely brit-tle and glass-hard.v A very simple… … Fig. 68. — Magnetic needle in acompass. Black end is north-seeking. NATURE AND PROPERTIES OF MAGNETISM 121 iV-pole, stroke the other half in the same way. In these daj^swhen electricity is so common, it is more usual to magnetizesteel by making it a part in the magnetic circuit of an…
Electricity · Magnetism
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