ire permanence by naturalselection, and is only knownto exist in one fossil specimen.In this instrument the wirebearing the gold leaf was connected with a charged Leydenjar, and the semi-cylinders with the bodies whose difference ofpotential was to be tested. But various modifications of… … 310 On EUctrometers and Electrostatic Measurements. [xx. 389. The heterostatic principle in one form or other isessential to distinguish between positive and negative. Asremarked above (§ 387), the original type of this use of it is tobe found in the old system of testing the quality of the…
Electricity · Magnetism
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