FRANKLIN, BENJAMIN. Experiments and Observations on Electricity, made at Philadelphia in America... to which are added, Letters and Papers on Philosophical Subjects. London: Printed for David Henry; and sold by Francis Newbery, 1769. 7 engraved plates by T. Jeffers, T. Hulett, and B. Cole. several wood-engraved diagrams in text. 4to, rebound in later calf, joints reinforced; B4 torn, 2 plates with margins cropped, others trimmed close, first few pages with light staining. FIRST COLLECTED EDITION, and the fourth overall. Sabin 25506; Howes F320; See: PMM 199.