Lodge, Oliver, Sir, 1851-1940 · London, New York, Macmillan and co. · leaf 164
pins with great rapidity. Reverse the current,and it rotates the other way. Conversely, by pro-ducing the rotation mechanically a current will beexcited in a wire joining the two pieces of tin-foil(Figs. 25, 26, and 27). The two contacts may be made anywhere on themagnet except symmetrically : if… … Fig. 25.—Round bright steel bar-magnet pivoted at its ends, spinning rapidly on itsaxis under the influence of a current supplied to either the bottom or top pivot,or both, and removed near the middle by a scrap of tin-foil lightly touching it.
Electricity
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