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Archimedes screw

261 bytes added, 05:41, 6 November 2012
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[[File:Archimedes-screw one-screw-threads with-ball 3D-view animated small.gif|thumb|250px|Archimedes' screw was operated by hand and could raise water efficiently. Animated GIF: [http://demonstrations.wolfram.com/ArchimedeanScrew/ Wolfram Demonstrations Project.]]]
 
[[Image:arch screw 2.jpg|thumb|right|250px|An Egyptian farmer turning an Archimedes screw by hand to irrigate a field. [https://www.cs.drexel.edu/~crorres/Archimedes/Screw/Applications.html Photo:] Helen and Frank Schreider of the National Geographic staff.]]
The Archimedes Screw (named after a Greek mathematician) is though to have been around since 250 B.C.E.
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