Photograph of a tub wheel from "Bow, N.H.", described as being very similar to the descriptions of the "wry fly" patented by Benjamin Tyler in 1800 and 1804, in Safford, Arthur T.; Hamilton, Edward P. (1922), "The American Mixed-Flow Turbine and Its Setting", "Transactions of the American Society of Civil Engineers" 48:4, p. 790. From page 1173/1464 of the Google Books PDF.