Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 940
is placed withan insulated tongue bent at right angles, and connected with a similarzinc disc supported about an inch above the copper. Dilute acid is placedso as to cover both discs, and some fine sawdust having been added tothe liquid, the whole is placed on the pole of an electromagnet.… … giving them in some cases a fixed direction, in others a continuous rotatorymotion. The first of these two actions may be thus enunciated : Every verticalctirretit movable about an axis ;parallel to itself places itself under the direc-tive action of the earth in a plane through this axis…
Physics
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