Electricity and magnetism : an elementary text-book, theoretical and practical (1920)
Glazebrook, Richard, Sir, 1854-1935 · Cambridge : The University press · leaf 348
22 338 ELECTRICITY [CH. XX cup, and from thence a current can be passed along the wire.Lines of magnetic force issue from the magnet and cut the■wire. If a current be passed through the wire it will beset into continuous rotation, the direction of which willdepend on that of the current. If the… … Fig. 208. A star-shaped disc can rotate easily about a horizontalaxis. The points of the star as the disc rotates dip into alittle mercury contained in a hollow in the stand of theinstrument, and a current passes through the disc betweenthe axis and this mercury. A horseshoe magnet is placed so…
Electricity · Magnetism
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