Electricity and magnetism : an elementary text-book, theoretical and practical (1920)
Glazebrook, Richard, Sir, 1854-1935 · Cambridge : The University press · leaf 337
is insulated from it and both cupscontain mercury. The second end of the coil is connected toa needle which dips into the mercurj in the annular cup andmaintains electric contact between it and the cup as the coilrotates round the central pivot; if then one pole of the batterybe connected to the… … Fig. 195. ABCDEFG is the wire balancing on a pivot at A. Thereis a bend in the wire at D to allow it to clear the support.If a current be passed through the coil from A to G it will befound that the face ABGEFG becomes a north face; the coilsets itself with its plane pointing east and west; the…
Electricity · Magnetism
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