London, L. Davis, 1756. 4to. Without wrappers. Extracted from "Philosophical Transactions", vol. 49, part 1. Including title-page and advertisement of volume. A fine copy. Pp. 299-310 + title-page.
First appearance of this paper in which he outlines three experiments in electric conductivity: 1. Electrical atmospheres, that flow around non-electric bodies, do not readily mix and unite into one atmosphere. 2. An electrical atmosphere, not only repels another electric atmosphere, but will also repel the electric matter contained in the substance of a body approaching it. 3. Bodies electrified negatively or deprived of their natural quantity of electricity, repel each other.
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