1Description of a Wheel Cipher, [before 22 March 1802] (Jefferson Papers)
...both officers of the American Philosophical Society, they conferred about astronomy, and in March 1798, Patterson provided TJ with detailed advice on the moldboard plow design, loaning him a book on mathematics. TJ also had time and inclination during his vice presidency to devote attention to scientific and technical subjects. Moreover, his passing reference to the wheel cipher in the 22...