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{{Language-box|english_link=Archimedes screw | french_link= Coming soon | spanish_link= Coming soon | hindi_link= Coming soon | malayalam_link= Coming soon | tamil_link= Coming soon | swahili_link=coming soon | korean_link= Coming soon | chinese_link=阿基米德螺旋泵 | indonesian_link= Coming soon | japanese_link= Coming soon }}
[[Image:arch screw icon.png|right|80px]]
[[Image:archimedes screw.jpg|thumb|right|200px|Farmers in Egypt's Nile delta turn a traditional (enclosed) screw by hand to irrigate a field. Photo: [http://www.waterencyclopedia.com/Po-Re/Pumps-Traditional.html#b Waterencyclopedia.com]]]
[[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|200px|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 is basically a large helix, open at both ends and encased within a watertight cylinder. It operates with the cylinder somewhat tilted from vertical. When the open lower end of the cylinder is placed in water and the screw is turned, water trapped between the cylinder and the threads of the screw rises. Successive revolutions will raise the water thread-by-thread until it emerges at the top of the cylinder.
The Archimedes Screw is still used today in some limited applications (usually electrically-powered), and can range in size from a quarter of an inch to nearly 4 meters (12 feet) in diameter. A large screw or banks of screws may be used to pump rainstorm runoff or to lift water or wastewater, for example.
Archimedes' screws, now called screw conveyors, are also used today primarily to propel dry bulk materials. However, if you do not have access to a generator pump and need a low-tech solution to raise water, it doesn't get much easier and low-tech than an Archimedes' screw. <ref> [httphttps://www.ehow.com/how_8725014_buildhow_5016689_build-handpoweredsimple-water-pump.html How to build and hand-powered water pump.] By Andrew Latham, eHow Contributor. </ref>
===Suitable conditions===
{{#ev:youtube|5gq3Vm4vifU|200|auto|<center>Tornillo de Arquímedes /<br> Archimedes' screw</center>}}
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* VIDEO: [http://youtu.be/5gq3Vm4vifU Tornillo de Arquímedes / Archimedes' screw]. An animated model, showing how the mechanics of the Archimedes Screw works to bring water up from a river.