If the uniting wire be placed in a horizontal plane under the magnetic needle, all the effects are the same as when it is above the needle, only they are in an opposite direction; for the pole of the magnetic needle next the negative end of the battery... Treatises on Electricity, Galvanism, Magnetism, and Electro-magnetism - Page 4 by Peter Mark Roget - 1832 - 316 pages Full view -
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