The world's earliest keeled waterwheel

Waterwheels and windmills operate by utilizing the energy generated by water power and wind power driving wheels with adjustable blades or stepped crosspieces, respectively. China is the world's first country to manufacture and use waterwheels, the Three Kingdoms when Ma reclaimed the creation of the keel waterwheel has been handed down for thousands of years to use, and has become China's rural water the best tool. <br> waterwheel placed in the river, the lower end of the trough and scraper straight into the water, the use of sprocket transmission principle, manpower as the driving force, driven by the wooden chain turned over again and again, mounted on the wooden chain on the scraper will be able to follow the trough of the river to lift the water to the shore, irrigation of farmland. The Netherlands is known as the "country of windmills", windmills are the symbol of the Netherlands. The Netherlands bordering the Atlantic Ocean, and is a typical oceanic climate countries, <br> located in the Earth's prevailing westerly wind belt, all year round and now become the second "Asia-Europe Continental Bridge" must pass through the place, the strategic location is very important.