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)
lants. 651. Figure 1.—Electrical effects.—If a dry and warm glassrod or tube be briskly rubbed with cats fur, or a piece of silk or woolen ELECTRICITY. 349 cloth, it attracts to itself bits of paper, shreds of cotton, gold leaf,feathers, pith, and other light substances, holding them for an… … to a metallic body, or to the knuckle of the finger, a purple spark willdart off from the glass with crackling sound. If the glass be held nearthe face, a sensation is experienced similar to that produced by draw-ing a fine thread across the skin. The same effects are produced bythe rubber. A…
Physics · Astronomy
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