Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
uare of the distance from their poles increases, being in accordanceAvith the common law. that regulates all forces which act from a centre,as that of heat, light, gravitation, etc. The most powerful magnets sustain about thirty times their ownweight. 608. Effect of heat on magnets.—The power of… … 609. Figure 38.—Various forms of mag-nets.—The l)ar magnet is a simple straight bar ofsteel. The horse-shoe magnet is the bar magnet bentin the form of a horse-shoe. The most powerful attraction takes place whenboth poles can be applied to the surface of a piece ofiron at once ; hence, to…
Physics · Astronomy
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