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A simple water pump is helping to improve the lives of poor families in several Asian and African countries. The treadle pump (脚踏抽水机) is based on a design developed in the 1970s by Norwegian engineer Gunnar Barnes. It can be made locally and easy to build from bamboo or other wood and two metal cylinders (圆筒) with pistons (活塞). The pistons go up and down as a person stands on lever (控制杆) devices, treadles, and uses a natural walking motion. How many hours a day the pump needs to be operated depends on the season and how much water is needed for crops. It could be two hours a day or seven hours a day. Small children sometimes stand with their parents on the treadles. Everyone in the family can take turns operating the pump. Families using them ate more vegetables, because they were able to grow more to eat and to sell. Many of these families also drank more milk, because they bought a cow with their added earnings. Men with treadle pumps often no longer have to leave the farm to seek extra work in cities. The pumps can also improve education. Farmers often use their extra earnings to buy books for their children or to pay for schooling. A farmer in Zambia said he hoped to have enough money in three years, to buy a diesel-powered pump. Then he could grow more crops over a larger area. But the world economic crisis has had an effect on some farmers. Even some who were able to buy diesel pumps now do not have enough money to buy fuel. So they are using their treadle pumps again. |