A text-book on chemistryFor the use of schools and colleges . MAGNETO-ELECTKIC CURKENTS. 179. The current runs round the coil in the direction of thearrows, and the ar- Fig. 153. rangement, obeyingthe magnetic influ-ence of the earth,turns with its planepointing north andsouth, just as a mag-netic needle would -^do. If the northend of a magnet,n s, be presented to-ward the loop,thewire will be attract-ed, and will place it-self midway between the ends of the magnet; but ifthe south end be presented, the wire will be repelled,the floating combination will turn half way round so asto reverse its
A text-book on chemistryFor the use of schools and colleges . MAGNETO-ELECTKIC CURKENTS. 179. The current runs round the coil in the direction of thearrows, and the ar- Fig. 153. rangement, obeyingthe magnetic influ-ence of the earth,turns with its planepointing north andsouth, just as a mag-netic needle would -^do. If the northend of a magnet,n s, be presented to-ward the loop,thewire will be attract-ed, and will place it-self midway between the ends of the magnet; but ifthe south end be presented, the wire will be repelled,the floating combination will turn half way round so asto reverse its direction, and will then be attracted. Ampere inferred from the analogy of these instru-ments that the magnet owes its qualities to electric cur-rents circulating in it in a transverse direction. The di-rective action of the magnetic needle or the electric he-lix depends on the action of electric currents circulatingin the earth, due to the unequal heating of its surfaceby the rays of the sun, the earth being regarded as anelectro-magnet, the poles of which are nearly in the lineof the a
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