1To Thomas Jefferson from David Rittenhouse, 28 September 1785 (Jefferson Papers)
That I have so long delayed acknowledging your favours has been owing to my absence from home....
2To Thomas Jefferson from David Rittenhouse, 26 June 1786 (Jefferson Papers)
Your favour of Jan. 25th. I received some time ago, and likewise all the Nautical Almanacs you...
3To Thomas Jefferson from David Rittenhouse, 14 April 1787 (Jefferson Papers)
About the latter end of June last I sent you the 2d. Vol. of our Transactions, directed to Mr....
4To Thomas Jefferson from David Rittenhouse, 8 November 1788 (Jefferson Papers)
About two Months ago I received your very valuable present of Books, mentioned in the last letter...
5To Thomas Jefferson from David Rittenhouse, 21 June 1790 (Jefferson Papers)
I received yours of the 12th. 14th. and 17th. together with the several papers mentioned, to...
6To Thomas Jefferson from David Rittenhouse, 25 June 1790 (Jefferson Papers)
Since my last letter (and not before) I have read Mr. Whitehursts Book on the Subject of...
7To Thomas Jefferson from David Rittenhouse, 2 July 1790 (Jefferson Papers)
I should not have troubled you with my Algebraical Calculations but for your present inconvenient...
8To Thomas Jefferson from David Rittenhouse, 4 January 1791 (Jefferson Papers)
Under the Building lately erected by the Philosophical Society there are very large and deep...
9To Thomas Jefferson from David Rittenhouse, 8 May 1791 (Jefferson Papers)
I thank you for a Sight of Mr. Randolph’s Letter. I must Confess I was pleased with Mr. Neville’s...
10To Thomas Jefferson from David Rittenhouse, [ca. 20 August 1791] (Jefferson Papers)
If we consider the same thing in the manner following we shall immediately perceive that the...