1To 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...
2To 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...
3To 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...
4To 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...
5To 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...
6To 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...
7To Thomas Jefferson from David Rittenhouse, 11 June 1792 (Jefferson Papers)
I have read over Mr. Keiths paper carefully, and endeavoured to make out his meaning. He has...
8To Thomas Jefferson from David Rittenhouse, 16 June 1792 (Jefferson Papers)
I have bargained with the owner for the House and Lot on Seventh Street, between Arch and Market...
9To Thomas Jefferson from David Rittenhouse, 27 November 1792 (Jefferson Papers)
The money granted by his Excellency the Presidents Warrant in July last being appropriated for...
10To Thomas Jefferson from David Rittenhouse, 28 November 1792 (Jefferson Papers)
By Act of Congress the Copper Coinage is limited to 150 Tons. This, counting the Ton to be 20...