Electricity and magnetism : an elementary text-book, theoretical and practical (1920)
Glazebrook, Richard, Sir, 1854-1935 · Cambridge : The University press · leaf 372
pending the coil and by means of which the current isbrought to it, exercise a constraint on the coil, and inconsequence it only turns until the couple due to the electro-magnetic action balances that due to the constraint. In some 362 ELECTRICITY [CH. XXII instruments the coil hangs by a single… … Fig. 225. passes in from above and out below the coil. In very sensitiveinstruments the lower wire is loose, the couple arises from thetorsion of the upper wire which is stretched by the weight ofthe coiL In other instruments again the suspension is bifilar; thecoil hangs from two very fine…
Electricity · Magnetism
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