The windmill
The windmill is a
machine driven by wind
power to grind grain. Windmills are also used to
pump water to irrigate the fields. Modern windmill is a
machine used to produce
electrical energy, also called wind turbines. Wind turbines are mostly found in Europe and North America.
The oldest manuscript of the windmills are in Arabic script from the 9th century AD who explained that the windmill which operated on the border of Iran and Afghanistan has existed since several centuries before, sometimes called Persian windmill. The same type used in China to evaporate sea water to produce salt. Last still used in the Crimea, Europe and the United States.
Windmills were first used to
generate electricity was built by P. La Cour of Denmark last the 19th century. After World War I, the screen with a cross section resembles a propeller plane angle is now called the propeller-type windmill 'or turbine. Experiments carried out twin angle windmills in the United States in 1940, its size is very large so-called Smith-Putman
machine, because it is designed by Palmer Putman, 1.25 MW capacity created by Morgen Smith Company of York Pennsylvania. His Pro Peler diameter 175 ft (55m) tower weighs 16 tons and as high as 100 ft (34m). But one of the stem His Pro Peler broken in 1945.