A single-page dictionary entry on the cotton gin from Knight's American Mechanical Dictionary. It describes the device credited to Whitney in 1794, in which saw-teeth pull lint from seed through a grid, and a variant with needle-pointed teeth on a segmented ginning cylinder. Two cross-section diagrams (Figs. 1486 and 1487) show the brush cylinder, mote-board, wire-gauze cylinder and compacting rollers.