In a Project Gutenberg book, Woodworking Tools 1600–1900. I found a plate #44 with an illustration of a brace, this is the authors note on that brace " *The complete break with the medieval, however, is seen in a drawing submitted to the Commissioner of Patents in 1865 (pat. 51,660) by Milton V. Nobles of Rochester, New York. Nobles' creation was of thoroughly modern design and appearance in which, unlike earlier types, the bit was held in place by a solid socket, split sleeve, and a tightening ring (fig.