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Experiments and observations in electricity : With a postscript, containing likewise a variety of new experiements and observations in that branch of philosophy; particularly an enquiry into the cause of the electricity of bodies, and the constitution of the electric matter itself; with notes tending to confirm and illustrate the opinions advanced / By William Henley. Read at the Royal society, Jan. 16 and 23, 1777. Public Domain Mark. Source: Wellcome Collection.