Everybodys Cyclopedia volume 3

Cover Everybodys Cyclopedia volume 3
Everybodys Cyclopedia volume 3
Charles Leonard Stuart
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That pole which points to the N. Is distinguished as the north by the sign plus ( + ) ; that which points to the S. As the south pole, by the sign minus ( ). The poles of the same denomination repel each other, while those of different names have mutual attraction.
Magnetism pervades the earth as electricity does the atmosphere. It assumes a totally different form in different substances ; the metals iron, nickel, and cobalt being strongly at- tracted by the magnet ; others such as bismuth, cop
...per, silver, gold, etc. , being as strongly repelled. The space in the neighborhood of a magnet is called the magnetic field; a piece of soft iron brought into this space be- comes magnetic, but it loses its mag- netism as rapidly on removal from the field. Steel has coercive force, in virtue of which it requires time for magnetization, and retains its mag- netism on removal from the field. Hard steel may be made magnetic by rubbing it several times in the same direction with a powerful magnet. The most powerful permanent mag- nets are produced by rubbing bars of steel on electro-magnets, or by mov- ing them backward along the axis of a coil of wire in which an electric current is passing.

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