A short encyclopedia entry on the cotton gin, describing an improved foot-operated roller gin used in South Carolina. The text explains each lettered part of the machine: treadle and crank, weighted flywheels, iron rollers turned in opposite directions by a strap, adjustable screws, a movable feed table and a seed trough. It claims a daily output of sixty-five pounds of cotton. An engraved plate shows the back view of the machine.