New experiments and observations on electricity. : Made at Philadelphia in America. / By Benjamin Franklin, Esq; and communicated in several letters to P. Collinson, Esq; of London, F.R.S. Part II.

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New experiments and observations on electricity. : Made at Philadelphia in America. / By Benjamin Franklin, Esq; and communicated in several letters to P. Collinson, Esq; of London, F.R.S. Part II. Public Domain Mark. Source: Wellcome Collection.