A two-page dictionary entry on "Gin" from Knight's American Mechanical Dictionary. It lists the word's several meanings, then covers portable hoisting gins (tripod, tackle, military classes, Vitruvius's description) and cotton gins that separate fiber from seed. The cotton-gin section describes the hand and roller-gins of India and China, Whitney's saw-gin of 1793, later feeder and brush-cylinder forms, and Calvert's toothed-roller gin, with engraved figures.