The term power loom, corresponds to a mechanized loom powered by a driveshaft. The first "power loom" was designed in 1784 by Edmund Cartwright and first built in 1785, later to be perfected by William Horrocks. It allowed textile making to be done far faster than if a human had done the same work. By 1850, over 250,000 of Cartwright's designs were used in England. James Henry Northrop invented the automatic "weft replenishment" loom. It revolutionized the weaving industry. Some 700,000 "Northrop" automatic looms were sold worldwide.