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The common sail is the simplest form of sail. In medieval mills, the sailcloth was wound in and out of a ladder-type arrangement of sails. 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 ...
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 gallery allowed access to the sails for making repairs because they could not be easily reached from the ground in larger mills. [17] Frame – Sail design that forms the outline of the sail, usually a meshed wood design that then is covered in cloth. The Mediterranean design is different in that there are several sails on the sail-frame ...
This was used to push the luff of the sail out into the wind. [22] Traditional Highland practice was to make sails of tough, thick-threaded wool, with ropes being made of moss-fir or heather. [23] Medieval sails, in the Highlands as elsewhere, are shown as being sewn out of many small squares, and there is possible evidence of reef points. [24]
Panemone windmill: The earliest recorded windmill design found was Persian in origin, and was invented around the 7th-9th centuries. [20] [21] 9th century. Algebra discipline: Al-Khwarizmi is considered the father of the algebra discipline. The word Algebra comes from the Arabic الجبر (al-jabr) in the title of his book Ilm al-jabr wa'l ...
Smock mill with fantail (Sønderho, Fanø, Denmark) Smock mill in Amsterdam Cobstone Windmill, Ibstone, Buckinghamshire. The smock mill is a type of windmill that consists of a sloping, horizontally weatherboarded, thatched, or shingled tower, usually with six or eight sides. It is topped with a roof or cap that rotates to bring the sails into ...
Medieval ships were the vessels used in Europe during the Middle Ages. Like ships from antiquity , they were moved by sails , oars , or a combination of the two. There was a large variety, mostly based on much older, conservative designs.