A windmill is a machine which converts the energy of wind into rotational energy by means of vanes called sails. Originally windmills were developed for milling grain for food production. In the course of history, the windmill machinery was adapted to many other industrial uses. An important non-milling use is to pump water, either for land drainage or to extract groundwater.
Read more about Windmill: Windmills in Antiquity, Horizontal Windmills, Vertical Windmills, Windpumps, Wind Turbine
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