Amsterdam, Netherlands: Pierre Mortier, 1737. Full Leather. As. Vol. I: , 136, -323; Vol. II: -696, -124 pp. 16mo. Contemporary brown leather bindings with gold embossed decoration to spine, five raised bands, dark brown title patches with gold embossed titling. Wear and rubbing but quite supple for their age. Very Good.
Milestone papers in the history of electricity. Through his four papers contained within Dufay explains his discovery of two kinds of electricity and the relation between them, attraction and repulsion, shocks and sparking, and the full recognition of electrostatic repulsion. Dufay formulates the two-fluid theory of electricity. He further showed that "not all bodies can become electrified themselves" (by friction) and went on to show, "that they can all acquire a considerable (electrical) virtue when the tube (of rubbed) glass), wood, metals or liquids are brought near them,", provided only that they are insulated by being stood on "a support of glass or of sealing-wax"