Wright, Mark R., 1854- · London : Longmans · leaf 141
of un-twisted silk, or by a horse-hair (fig. 118). A paperstirrup is also convenient(fig. 120). (2) Place the bodyon a piece of cork floating inv/ater (fig. 121). (3) In ordi-nary magnets a hole is drilledthrough the centre of massof the needle, generally cut lozenge-shape, and a brass cap is… … Fig. 120. Magnetic Induction 133 be made thus :—Find as nearly as possible the centre of mass ofa knitting-needle. Heatthe needle to a red heat(preferably over a char-coal fire), and bend itinto the shape of fig. 123.Again make it red-hot,and throw it into water, in order to temper it. Magnetise it…
Physics
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