Extract from Thomas Jefferson to Jonathan Williams
|Monticello July 2 3. 1796.|
I examined with great satisfaction your barometrical estimate of the heights of our mountains, and with the more as they corroborated conjectures on this subject which I had made before. my estimates had made them a little higher than yours (I speak of the blue ridge.) measuring with a very nice instrument the angle subtended vertically by the highest mountain of the Blue ridge opposite to my own house at from a distance of about 18. miles South westward I made the height about 2000. f. as well as I remember, for I can no longer find the notes I made.