1From Thomas Jefferson to David Rittenhouse, 22 February 1791 (Jefferson Papers)
Th: Jefferson will be obliged to Mr. Rittenhouse to inform him who has the best assorted shop of Mathematical instruments in town. RC (Miss Elizabeth Sergeant Abbot, Philadelphia, 1954). Not recorded in SJL . TJ’s inquiry was made in behalf of George Wythe (see Wythe to TJ, 10 Jan. 1791 ; TJ to Wythe, 14 Mch. 1791 ).
2From Thomas Jefferson to David Rittenhouse, 19 March 1791 (Jefferson Papers)
I have to regret that having rode into the country yesterday afternoon, I did not return till it was too late either to take tea with you, or to go to the society, where I should have been pleased to hear Mr. Barton’s paper read. Will you be so good as to express to him my regrets? I send for your acceptance some sheets of drawing-paper, which being laid off in squares representing feet, or...
3From Thomas Jefferson to David Rittenhouse, [21 March 1791] (Jefferson Papers)
Th: Jefferson sends to Mr. Rittenhouse Bp. Watson’s essay on the subjects of chemistry, which is too philosophical not to merit a half an hour of his time, which is all it will occupy. He returns him Mr. Barton’s papers which he has perused with great pleasure. He is glad the subject has been taken up and by so good a hand. He has certainly done all which the scantiness of his materials would...