Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 281
on its middle point, thecurrent being brought to a mercury cup supported upon therevolving magnet, and carried away by a bent wire which dipsinto an annular cup of mercury, with which the battery wireis connected. On passing a strong current, the magnet polerotates steadily, and on reversing the… … Fig 161. current exerts on a pole, the pole must exert an exactlyequal and opposite force on the current. Thus the system offorces between a magnet pole and a current consists of a couple,and the current, if free to move, will spin round the pole,having the same direction of rotation relatively to…
Electricity
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