How to make a subway car

/me? ct=20 1326592。 cl = 2 & amplm=- 1。 tn = baiduimage & ampB2 % B3 % B5 & amp； z=0

Same car

Also known as "water drum". Water-powered tools for irrigating fields. The principle is as follows: hit two hard piles on the bank where the water is very fast to make a big wheel, and the shaft of the big wheel is placed on the pile fork. The upper part of the big wheel is higher than the embankment, and the lower part is immersed in water and can rotate freely. The bamboo tube is obliquely tied to the water receiving plate outside the wheel spokes, and a water tank is arranged on the bank of the wheel near the water receiving pipe. When the water receiving tray of the big wheel is impacted by the rapids, the wheel rotates and the water tank is filled with water. When the wheel top rotates, the cylinder mouth inclines downward, and water just pours into the sink and flows to the field along the sink. This kind of truck irrigates the land day and night, without the help of people and animals, with high efficiency, which was produced in Sui and Tang Dynasties. Liu Yuxi, a poet in the Tang Dynasty, described it in Ji Ji Ji. Until today, Yunnan, Guangxi, Sichuan, Gansu, Shaanxi, Guangdong and other places are still in use. In addition, there are "animal-drawn gondolas", which are driven by gear transmission; The "high rotating drum" transports water from the lower part to the higher part through two wheels. Its structure is ingenious and reasonable, and it is an outstanding invention of the ancient people in China. Tang Chen's "Water Wheel Fu": "Water can benefit things, but the wheels are curved. The ups and downs are all used by farmers, and the low ones follow the craftsmen. When the electricity collapsed, Russia turned to the wind. Although breaking the waves in Sichuan, there is not a trace of kindness; I swam in Apollo and there was noise all night. "Song Mei Yao Chen's Ode to the Waterwheel": "A solitary wheel carries cold water, and there is nothing for a yeoman. With the flow of self-speed, the height is still inclined. " "Song history. Mao San Ji: "In June, Gengzi stepped to the Jin Palace, and was ordered to be a motorized wheel, taking the Jinshui River and injecting it into the pond in the mansion. "Song and Quan's poem" Tugui Yingfu Waterwheel "says:" The waterwheel in the south of the Yangtze River is not a fake person, and the wise man's creation is really clever. A round of ten barrels and one banknote goes on and on. "Wang Ming Lin Heng's" Jian Yue Discrimination "Volume III:" The waterwheel, with one water tank per spoke, leans forward and leans back, turns the wheels up, just pours them into the sink, and takes the height of the field as the size of the wheels, that is, the fields over three or four feet can be irrigated without manpower. "