Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 94
75 manner we use the electroscope to distinguish even very-feeble charges of electricity.1 56. Development of the two Electricities, simulta-neous and in equal quantities.—It will now be easy toshow that these opposite electricities are always developedtogether; that where the glass was charged… … Fig. 50. This can be shown (Fig. 50) by taking a plate of window-glass, and a rubber made of leather covered on its flat surfacewith silk (better if amalgamated, as for the electrical machine),and furnished with a glass handle. On simply turning therubber round on the plate a few times, the…
Electricity
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
