A windmill is a mill that converts the energy of wind into rotational energy by means of vanes called sails or blades Centuries ago, windmills usually were used to mill grain, pump water, or both. Thus they often were gristmills, windpumps, or both.
A windmill is a mill that converts the energy of wind into rotational energy by means of vanes called sails or blades Centuries ago, windmills usually were used to mill grain, pump water, or both. Thus they often were gristmills, windpumps, or both.