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Archimedes screw
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Archimedes Screw
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One of the earliest kinds of pump, associated with the Greek mathematician Archimedes. It consists of a large spiral screw revolving inside a close-fitting cylinder. It is used, for example, to raise water for irrigation.
The lowest portion of the screw just dips into the water, and as the cylinder is turned a small quantity of water is scooped up. The inclination of the cylinder is such that at the next revolution the water is raised above the next thread, whilst the lowest thread scoops up another quantity. The successive revolutions, therefore, raise the water thread by thread until it emerges at the top of the cylinder.
© Research Machines plc 2008. All rights reserved. Helicon Publishing is a division of Research Machines plc.
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