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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.
Great windmill, Byasa dasarada, has a number of two white spots in 4, 5 on the upperside of the hindwing and three spots on 4, 5 and 6 on the underside of the hindwing. It is a slightly larger butterfly with a broader swallowtail. Other windmills are smaller, rarer and have small differentiating characters from the above three common windmills.
The white or silver side of the vanes are slightly warmer than the internal air temperature but cooler than the black side, as some heat conducts through the vane from the black side. The two sides of each vane must be thermally insulated to some degree so that the polished or white side does not immediately reach the temperature of the black side.
Brill windmill, a 17th-century post mill in Buckinghamshire. The post mill is the earliest type of European windmill. Its defining feature is that the whole body of the mill that houses the machinery is mounted on a single central vertical post. The vertical post is supported by four quarter bars. These are struts that steady the central post.
[1] [2] Wind power was widely available and not confined to the banks of fast-flowing streams, or later, requiring sources of fuel. Wind-powered pumps drained the polders of the Netherlands, and in arid regions such as the American midwest or the Australian outback, wind pumps provided water for livestock and steam engines.
Diagrams and maps of Murray's U.K. semaphore stations; Chart of Murray's shutter-semaphore code; Photo and diagrams of Popham's U.K. semaphore stations; Map of visual telegraph (semaphore) and electrical telegraph lines in Italy, 1860 (in Italian) Details on the history of the Blanc brothers fraudulant use of the Semophore line
A diagram of a panemone whose wind-catching panels are arranged to turn edge-on to the wind when moving against the wind's thrust, and side-on when moving downwind to harness the wind's motion. A panemone windmill is a type of vertical-axis wind turbine. It has a rotating axis positioned vertically, while the wind-catching blades move parallel ...
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