The mutivaned windmill, developed in the United States in the last half of the 19th century, consists of a number of small metal vanes set in a wheel. It was widely adopted by the end of the century, and thereafter its use spread through the world. As standardized, it has a wind wheel 8 feet in diameter with many steel blades set close together. Mounted on a steel tower about 35 feet high, this windmill is usually geared to a pump that can be detached and operated by hand. The mill can pump water from great depths for livestock, irrigation, or household use.
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