How to use the water wheel of ancient Vietnamese

A water wheel, also known as a water wheel or water rod, is a machine used to convert the energy of flowing or falling water into useful forms of energy, usually in a watermill. A waterwheel consists of a wheel (usually made of wood or metal), with multiple blades or buckets arranged on the outer wheel rim, forming the driving surface. Most commonly, the wheel is driven vertically to a horizontal wheel hub, but can also be driven horizontally to a vertical shank. The longitudinal wheel can transmit power either through the wheel hub or through a gear ring and make the belt or gear move; The horizontal wheel normally makes its load move directly.