1To Thomas Jefferson from Robert R. Livingston, 4 June 1800 (Jefferson Papers)
I did not receive your favor of the 17th : Apl till on my Return to this place from New York, owing to its having gone on to my country residence while I was on my way down. I have also received the transactions of the Philosophical society with the model of your mould board. I have considered it with attention, & am satisfied that it is an important improvement, & the rather as it is...
2Enclosure: Description of a Steam Engine, 4 June 1800 (Jefferson Papers)
Description of mercurial engine The figure represents an engine intended to work with very little friction. It must be observed that in order to simplify the drawg an ejection cock on the old principle is substituted for an air pump & condenser which however is to be preferred in practice—Nor can the enjection be made in the manner shewn in the drawing without a snifting valve for each side of...