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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.
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 ...
The parallel walls are up to 2.8 metres (9 ft 2 in) thick at the base. [6] A 3.8 metres (12 ft 6 in) high mound was thrown up around the mill for the miller to reach the sails. In the old situation the internal space at ground level was unused and the only entrance into the mill was at the current hoisting floor, only reachable by an outside ...
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. It was first built to pump water, and subsequently modified to grind grain as well. [1]
Drinkstone Post Mill was built in 1689, making it the oldest windmill in Suffolk. [4] Samuel Clover was given the post mill, horse mill and mill house by his father (Samuel Sr) in 1775. The mill passed to his son (Samuel Jr, b1752) and thence through a succession of Clovers to Wilfred, who took the mill on the death of his father Daniel in 1947.
Button's Mill was a six-storey tower mill with a domed cap which was winded by a fantail. It was built with eight sails but rebuilt with four double Patent sails in 1837. . The sails had a span of 66 feet (20.12 m) and were 9 feet (2.74 m) wide.
It had four Spring Patent sails carried on a cast iron Windshaft. The iron Brake Wheel is fitted with Holloways screw brake. The mill drove three pairs of underdrift millstones. [4] The tower is 19 feet (5.79 m) diameter at the base and 13 feet (3.96 m) diameter at the curb, having an overall height to 40 feet (12.19 m) to the curb. [4]
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