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Wind-powered machines used to grind grain and pump water, the windmill and wind pump, were developed in what are now Iran, Afghanistan and Pakistan by the 9th century. [ 1 ] [ 20 ] The first practical windmills were in use in Sistan , a region in Iran and bordering Afghanistan, at least by the 9th century and possibly as early as the mid-to ...
The windmills at Kinderdijk in the village of Kinderdijk, Netherlands is a UNESCO World Heritage Site. A windmill is a structure that converts wind power into rotational energy using vanes called sails or blades, by tradition specifically to mill grain (), but in some parts of the English-speaking world, the term has also been extended to encompass windpumps, wind turbines, and other applications.
The earliest recorded windmill design found was Persian in origin, and was invented sometime around 700–900 AD. [ 3 ] [ 4 ] This design was the panemone, with vertical lightweight wooden sails attached by horizontal struts to a central vertical shaft.
By 1908, there were 72 wind-driven electric generators operating in the United States from 5 kilowatts (kW) to 25 kW. Around the time of World War I, American windmill makers were producing 100,000 farm windmills each year, mostly for water-pumping. [15]
Poul la Cour (13 April 1846 – 24 April 1908) was a Danish scientist, inventor and educationalist. Today la Cour is especially recognized for his early work on wind power, both experimental work on aerodynamics and practical implementation of wind power plants.
This is at least partly due to usage by windpump builders Eclipse Windmill Company (1873) and Aermotor Windmill Company (1888, the sole surviving US "windmill" manufacturer [1]). And it is also used by many to refer to modern wind turbines generating electricity.
A flatpack wind turbine invented by a 15-year-old Scottish pupil is to be used to help provide power to communities in Kenya. Douglas Macartney, now 19, designed the turbine for a competition in ...
The Campaign for a Commercial-Free Childhood (CCFC) and the Center for Digital Democracy (CDD) both expressed concern over the use of advertising within the YouTube Kids app, arguing that children would not be able to distinguish the ads from content. Short bumpers were later added to the app to establish a separation between advertising and ...