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Archimedes screw

43 bytes added, 02:08, 6 November 2012

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[[Image:arch screw icon.png|right|100px]]

 

[[Image:archimedes screw.jpg|thumb|right|250px|Farmers in Egypt's Nile delta turn a traditional screw by hand to irrigate a field. Photo: [http://www.waterencyclopedia.com/Po-Re/Pumps-Traditional.html#b Waterencyclopedia.com]]]

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