shaduf


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shaduf

or

shadoof

(both: shədo͝of`, shä`do͝of), primitive device used to lift water from a well or stream for irrigation purposes. Essentially the device consists of a long boom balanced across a horizontal support from 8 to 10 ft (2.4–3 m) above the ground. The beam has a long, thin end and a short, stubby end. From the long end a bucket or similar container is suspended, and on the shorter end there is a counterweight. The operator pulls on a rope that lowers the long end of the boom so that the bucket submerges and is filled with water. He then releases the rope, allowing the counterweight to raise the bucket to the desired level, and then empties the bucket and repeats the process. Shadufs can be used in a series where it is desired to raise water to a height exceeding the range of a single one. It has been suggested that the massive stones used in building the pyramids of Egypt were raised by an ancient variant of this device.
References in periodicals archive ?
Various facts cross the screen including: "The area of the surface of the earth is 196,937,600 miles"; "247,860 people are born every day"; "The oldest known song is the Shaduf Chant"; and then it ends with a warning of "Doomsday.
It is believed that the zajarah is somewhat similar to shaduf, one of the oldest known tools used to raise water from a well, river or lake.
Year 10 pupils from Cardinal Newman Catholic Comprehensive in Rhydfelin, Tonyrefail Comprehensive, and Ysgol Gyfun Rhydywaun, in Hirwaun, were challenged by Welsh Water to produce a shaduf, a chain pump and an Archimedes screw.