1To Thomas Jefferson from John Taylor, 19 November 1797 (Jefferson Papers)
Herewith I have forwarded to you the drill you requested, packed into a crate basket, in a secure manner. This machine is an improvement upon that heretofore sent you, in having cups cut into iron rollers, instead of being fixed to bands. The effect, is perfect regularity in the sheding of the grain, because no change will be produced by the quantity in the box—because these cups must fill...
2To Thomas Jefferson from John Taylor, 14 October 1797 (Jefferson Papers)
A model of Martin’s machine for seperating the grain of wheat from the straw, is now before me, and yet simple as it is, I have no hopes that my mechanical knowledge is equal to a description so perspicuous, as to enable you to erect one. For it probably bears a very distant analogy to the Scotch machine or to Booker’s, neither of which had ever been seen by Mr: Martin, when he invented his....