Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 256
pur-pose, as charging a jar. 833. The Electrophorus acts only by induction, and de-pends upon the roughness of the surface of the resin. Me-chanical labor is expended in separating the cover fromthe resin for each spark, so that mechanical energy is ♦Conveniently made of four parts resin and one… … Fig. 294. 835. The Plate Machine, Fig. 294, consists of a large glass platefixed upon wooden supports, and turned by a crank. A pair ofleather rubbers, which have been covered with an amalgam ofmurcury, tin and zinc, are made to press upon the plate by a brassspring. These rubbers are usually…
Physics
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