1Enclosure: Alden Partridge to Jonathan Williams, 19 January 1812 (Jefferson Papers)
Reflecting a few days ago upon the manner of ascertaining the initial velocities of Military projectiles, by means of the ballistic pendulum, it struck my mind that this method is not altogether accurate. I take the liberty therefore to state to you what appears objectionable in it, requesting if I am in an error you will have the goodness to rectify it. The method above alluded to seems to be...