Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 414
eticneedle produces but a very slight deflection; but if the wire is wound into a coil, and the cur-rent made to pass several timesin the same direction, either overor under the needle, or, betterstill, if it passes in one directionover it and in the opposite direc-tion under it, the effect will… … Fig. 487.—Oersteds experiment.
Physics
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