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Medieval sails could be constructed with or without outer sailbars. Post-medieval mill sails have a lattice framework over which the sailcloth is spread. There are various "reefs" for the different spread of sails; these are full sail, dagger point, sword point and first reef. The mill must be stopped in order to adjust the reefing of the sail. [1]
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.
To increase windmill efficiency millwrights experimented with different methods: automated patent-sails instead of cloth spread type sails didn't need the sail cross to be stopped to spread or remove the cloth sails because they altered the surface from inside the mill by means of a controlling gear.
Charles Brush's windmill of 1888, used for generating electricity. Wind power has been used as long as humans have put sails into the wind. Wind-powered machines used to grind grain and pump water — the windmill and wind pump — were developed in what is now Iran, Afghanistan, and Pakistan by the 9th century.
The windmill's wheel has a diameter of 25.35 meters. [ 43 ] [ 9 ] [ 10 ] The sails covering the two pairs of wings, which are composed of four 10-meter-long canvas sheets [ 167 ] spaced 1.5 meters around the hub of the main shaft, [ 59 ] are supported by a frame of welded steel bars that extend over 25 meters in length.
The body of the windmill can be turned around the central post to bring the sails into the wind. All post mills have an arm projecting from them on the side opposite the sails and reaching down to near ground level. With some, as at Saxtead Green, the arm carries a fantail to turn the mill automatically. With the others the arm serves to rotate ...
Waterhall Mill, also known as Westdene Windmill, is a grade II listed [1] tower mill at Westdene, [2] Sussex, England which has been converted to residential use. History [ edit ]
South Marsh Mill is a five-storey tower mill. She had four Patent sails carried on a cast iron windshaft. The cap was a beehive shape, winded by a fantail.The mill drove three pairs of millstones.