Cf. Ford, Franklin bibliography, nos. 77 and 93. No. 1 of 7 titles bound together. Part II published by Cave in 1753; title of pt. II reads: Supplemental experiments and observations on electircity [!] part II. Made at Philadelphia in America by Benjamin Franklin, esp; and communicated in several letters to P. Collinson, esq; of London, F.R.S. Signatures: [A]² B-M⁴. With a final leaf of advertisements.
, 86,  p.,  leaf of plates : ill. ; 26 cm. (4to)
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English short title catalogue, entry T10116 and Sabin, 25505