WATSON (William). Experiments and Observations tending to illustrate the Nature and Properties of Electricity. In one Letter to Martin Folkes, Esq; President, and Two to the Royal Society. London, Printed for C. Davis, Printer to the Royal Society, 1746. Third edition, [2], viii, 59, [1]pp. [Bound with:-] WATSON (William) A Sequel to the Experiments and Observations tending to illustrate the Nature and Properties of Electricity: wherein it is presumed, by a Series of Experiments expresly [sic] for that Purpose, that the Source of the Electrical Power, and its manner of acting are demonstrated. Addressed to the Royal Society.1746

London: Printed for C. Davis, Printer to the Royal Society, First edition, [2], 80pp., folding engraved plate, closed tear in final leaf, expertly repaired and no loss of text. 2 works bound as one, 8vo (200 x 120 mm), modern vellum-backed marbled boards, spine lettered in gilt, a nice copy. Watson was the most distinguished name in this period of the history of electricity, and this was his principal work. He was the first to observe the flash of light attending the discharge of a Leyden jar, and he provided the first demonstration of the passage of electricity through a vacuum, and the plus and minus of electricity. Mottelay, pp.175-177; Baaken, p.115.