1From Benjamin Franklin to Thomas Gilpin, 10 July 1769 (Franklin Papers)
ALS : American Philosophical Society I received your Favour per Capt. Osborne, with the Model of your Machine for raising Water. The Manner in which you have apply’d a single Crank for the Working of three Pumps, wherein the whole Force is apply’d to each, and yet in such quick Succession that there is no Loss of Time, appears to me so extreamly ingenious, that I have scarce ever seen a new...