11To Benjamin Franklin from Thomas Gilpin, 16 May 1769 (Franklin Papers)
Reprinted from “Memoir of Thomas Gilpin,” Pennsylvania Magazine of History and Biography , XLIX (1925), 304. By the brig Ketly Capt. Osborne I have sent you the model of a machine the result of a thought occurring to me some time ago which I have realised in the present form. It is that of an horizontal windmill applied to three pumps——this application as one of the most useful for raising...