ARROWSMITH, the name of an English family of geog raphers. The first of them, Aaron Arrowsmith (1750-1823), made himself famous by his large chart of the world on Mercator's pro jection (17oo). Four years later he published another large map of the world on the globular pro jection, with a companion vol ume of explanation. He left two sons, Aaron and Samuel, the elder of whom was the compiler of the Eton Comparative Atlas, of a Biblical atlas, and of vari ous manuals of geography. They carried on the business in com pany with John Arrowsmith nephew of the elder Aaron. In 1834 John pub lished his London Atlas, the best set of maps then in existence. He followed up the atlas with a long series of elaborate and carefully executed maps, those of Aus tralia, America, Africa and India being especially valuable.