The Renewable Energy Source of Windmills
This windmill is a machine which converts the energy of wind to rotational motion by means of adjustable sails. The main use is as a grinding mill powered by the wind, reducing a solid or coarse substance into pump or minute grains, by crushing, grinding, or pressing. Windmills have also provided energy for obtaining fresh water from underground or drainage.
Government Printing Office The Official Gazette of the United States Patent Office (Washington, DC: Government Printing Office, 1895)