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The screw pump is the oldest positive displacement pump. [1] The first records of a water screw, or screw pump, date back to Hellenistic Egypt before the 3rd century BC. [1] [3] The Egyptian screw, used to lift water from the Nile, was composed of tubes wound round a cylinder; as the entire unit rotates, water is lifted within the spiral tube to the higher elevation.
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Water flows freely off the end of the screw into the river. The upper end of the screw is connected to a generator through a gearbox. The Archimedes screw is theoretically a reversible hydraulic machine, and there are examples of single installations where screws can be used alternately as pumps and generators.
Portal:Physics/Selected images/13 Johannes Kepler (December 27, 1571 – November 15, 1630) was a German mathematician, astronomer and astrologer. A key figure in the 17th century scientific revolution , he is best known for his eponymous laws of planetary motion , codified by later astronomers, based on his works Astronomia nova , Harmonices ...
Archimedes Screw Pump. One of the US's oldest surviving examples of the wind-driven Archimedes screw-pump. 1890 Newark: California United States ASME brochure: 92: 1984 Stanford Linear Accelerator Center. Unique electromechanical devices and systems in the longest accelerator in the world. 1962 Menlo Park: California United States ASME brochure ...
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The screw pump is commonly attributed to Archimedes on the occasion of his visit to Egypt, but this tradition may reflect only that the apparatus was unknown to the Greeks before Hellenistic times and introduced in his lifetime by unknown Greek engineers.
Archimedes screw: Water is fed into the top of the screw forcing it to rotate. The rotating shaft can then be used to drive an electric generator. A gear box is required, since the rotational speed is very low. The screw is used at low heads (1.5–5 metres) and medium to high flows (1 to 20 m 3 /s). For higher flows, multiple screws are used.