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)
ed to each other. This sys-tem is suspended from a suitablesupport by a hair or fibre of raw silk, H, and is a sensitive test forfeeble magnetic currents. 635. Figure 67.—Magnetic needle.—The drawing representsa simple magnetic needle, being nothing more than a piece of hard-ened steel, tapered… … 636. Directive forceof magnets.—By the di-rective force of magnets, ismeant, the tendency whichthey have to arrange them-selves in such a manner that their like poles will be reverse to eachother, which is in obedience to that fundamental law of magneticattraction, which causes like poles to repel…
Physics · Astronomy
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