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)
r pencil, visible in the dark. 667. The loss of electricity in excited bodies is constant,chiefly from two causes : 1st, the moisture of tlie air ; and, 2d, from theimperfection of the insulation, even when the best insulators areemployed. INDUCTION OF ELECTRICITY. 668. Figure 7.—Bodies electrified… … If the prime conductor be charged with positive electricity, andplaced within a few inches of the cylinder, the pith-balls near the con-ductor, E, will be attracted and separated; those at the opposite end I ELECTRICITY. 357 will be repelled and separated; while those in the central part will notbe…
Physics · Astronomy
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