Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . 148 DAVISS MANUAL. them nearly equally to the influence of the magnet,the attraction becomes scarcely perceptible. Thus,let M (Fig. 98) be the south pole of a bar or horse- Fig. shoe magnet, and A a piece of sheetiron somewhat smaller than theend of the magnet. When thisiron plate is placed in the positionrepresented in the upper figure, thesurface next the pole of the magnetacquires north polarity, while theopposite surface becomes south,and, th
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . 148 DAVISS MANUAL. them nearly equally to the influence of the magnet,the attraction becomes scarcely perceptible. Thus,let M (Fig. 98) be the south pole of a bar or horse- Fig. shoe magnet, and A a piece of sheetiron somewhat smaller than theend of the magnet. When thisiron plate is placed in the positionrepresented in the upper figure, thesurface next the pole of the magnetacquires north polarity, while theopposite surface becomes south,and, the iron being thin, the twosurfaces are both so near to themagnet that one is repelled nearly as much as theother is attracted. The thin plate will be found toadhere to the pole with a very slight force, and willtend to slip down into the position represented inthe lower figure. In this position it is much morestrongly attracted; for the two ends, instead of thetwo sMiifaces, become the poles, and the end in con-tact is attracted, and the remote end repelled. Thesame effect will be produced if the plate is appliedto the pole of the magnet by its edge, instead ofby one of its surfaces; by this means, the repelledpole of the plate is removed to a distance from themagnet. 236. The inductive action of a magnet is not im-pe
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
