1Robert Patterson to Thomas Jefferson, 25 March 1813 (Jefferson Papers)
Your time-piece has been packed up, ready for shipment, in the manner you directed, for a considerable time. But as soon as our river was had been rendered navigable, by the breaking up of the ice, it was again stoped & still continues to be so, by a British fleet. I am therefore, Sir, about to set it up at my own house, as it will be better to keep it going than standing; & shall wait your...
2Robert Patterson to Thomas Jefferson, 24 April 1813 (Jefferson Papers)
I have to acknowledge the receipt of your esteemed favour of the 8 th . Your time-piece, agreeably to your desire, I have had set up at my own house, & shall with great pleasure make experiments on its going with the rod-pendulum. This pendulum is at present suspended by a few inches of watch-spring attached to the upper end, as in common pendulums: But M r Adrain , an able mathematician, in...