1To Thomas Jefferson from Robert R. Livingston, 10 December 1790 (Jefferson Papers)
The enclosed was written long since and accidentaly detained at New York. I send it now to shew that I have not been inattentive to the letter you favoured me with and somewhat to shorten what I am now to tell you of the result of the experiment you encouraged me to make. In order to gain room for affixing the hollow cylinder or tub to the spindle of the mill it was necessary to make a new cog...