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)
to acopper bottom, and a zinc cylinder,z, fitting between them. The li-quid employed is a solution of sul-phate of copper (blue vitriol). Thezinc cylinder is prevented fromtouching the copper by means ofthree pieces of wood or ivory (notshown) projecting from the top ofthe zinc cylinder, and… … 7S7. Figure 36.—Bohnenbergers dry pile electroscope consists of two dry voltaic piles (728), arranged under a glass jar, ELECT1UCIT7. 387 having a strip of gold-leaf or a pith-ball suspended between their op-posite poles, R and H, and connected with the rod and knob, P. If a positively-electrified…
Physics · Astronomy
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