Gerard, Eric Mary, 1856-1916 · New York W.J. Johnston · leaf 236
the air is par-tially exhausted. If the conductor a passes round the mid-dle of the magnet ns the luminous band is seen to turn aboutthe magnet by reason of the electromagnetic force whichimpels it. A liquid traversed by a current and situated in a mag-netic field will likewise assume a movement… … Fig. 77. axis conducts the current to the wheel, from which it passesinto a trough of mercury, into which the lower edge of thewheel dips. The part of the wheel traversed by the current is em-braced between the poles of a horseshoe magnet, N. Theelectromagnetic force tends to turn the wheel in the…
Electricity · Magnetism
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