With the large-scale development of Dutch people's reclamation project, windmills have played a great role in this arduous project. According to the local wet and rainy climate and changeable wind direction, they reformed the windmill. The first is to equip the windmill with a movable canopy. In addition, in order to be exposed to the wind from all sides, they installed the roof of the windmill on rollers. This kind of windmill is called Dutch windmill.
The biggest windmill in Holland is several stories high, with wings as long as 20 meters. Some windmills are made of a whole piece of oak. /kloc-by the end of the 8th century, there were about 12000 windmills in the Netherlands, each with 6000 horsepower. These windmills are used to grind grain, coarse salt, tobacco leaves, press oil, roll woolen cloth, felt, make paper and drain water from marshes. It is these windmills that constantly absorb and drain water, which ensures that two-thirds of the country's land is free from destruction and the threat of artificial fish and turtles.
Since the 20th century, due to the development of steam engines, internal combustion engines and turbines, the ancient windmills that rely on wind power have once become dim and almost forgotten. However, because the windmill uses natural wind power, there is no danger of pollution and exhaustion, so it has not only been used by the Dutch people until now, but also become a new energy source today, which deeply attracts people.