1To George Washington from Jacob Isaacks, 17 August 1790 (Washington Papers)
The inclosed copies of certificates Signed By Several Gentlemen of this Town Will Inform You Respecting a discovery that I have Recently Made, and which if encouraged will I flatter myself be highly beneficial to Mankind, and Particularly to those concerned in navigation, As the apparatus is so simple, that an extraction can be performed on board any Vessell at a very trifling expence. A...