Introductory course of natural philosophy for the use of schools and academies. Ed. from Ganot's popular physics. By William G. Peck (1869)
Ganot, Adolphe, 1804-1887, Peck, William Guy, 1820-1892 · New York A.S. Barnes · leaf 380
in Fig. 248. It will be seen here-after, that resin andother substances namedabove, not only developforces of attractionwhen rubbed, but alsothey become luminous,emit sparks, and dis-play a number of otherproperties, all of whichare known as electricalphenomena. Since the beginningof the… … Fig. 248. Sources of Electricity. 360. The sources of electricity may be divided intothree classes: Mechanical, Physical, and Chemical. The mechanical sources are: friction, pressure, and separ-ation of the molecules of bodies. When a piece of sugar isbroken suddenly in a dark room, a feeble light…
Physics
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