1Gideon Fitz to Thomas Jefferson, 20 June 1810 (Jefferson Papers)
About ten days since, I wrote you on the subject of a Wind mill of my own invention, soliciting your opinion of its usefulness, and that it might be patented in case you should think it deserving that attention. In little time after writing I discovered a material error which had happened from overlooking a small circumstance in estimating its power of raising weight. Although the Wheel runs...