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, contemporary calf, minor wear to spine ends. FIRST COLLECTED EDITION, and fourth overall. Sabin 25506; Howes F320; See PMM 199.