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)
ubbing resin or sealing-wax iscalled resinous or negative electricity. Glass and resin are but types of two large classes of substances, whichpossess more or less perfectly this characteristic difference, as above ex-plained. 654- ^^^ theory of two fluids.—This theory is based uponthe supposition… … ELECTRICITY. 351 only contain it are said to be neutral. The earth is considered a greatreservoir of this fluid. If this neutral fluid is decomposed, and the two fluids separated, bywhatever means, then various electrical phenomena are immediatelymanifested. If glass is rubbed with silk, the…
Physics · Astronomy
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