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Archimedes screw

Archimedes' screw

The Columbia Encyclopedia, 6th ed. | 2011 | Copyright

Archimedes' screw a simple mechanical device believed to have been invented by Archimedes in the 3d cent. BC It consists of a cylinder inside of which a continuous screw, extending the length of the cylinder, forms a spiral chamber. By placing the lower end in water and revolving the screw, water is raised to the top. The principle is applied in machines used for drainage and irrigation, and also in some types of high-speed tools. It can also be applied for handling light, loose materials such as grain, sand, and ashes.

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"Archimedes' screw." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 25 May. 2012 <http://www.encyclopedia.com>.

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Archimedes' screw

World Encyclopedia | 2005 | Copyright

Archimedes' screw Machine used for raising water, thought to have been invented by Archimedes in the 3rd century bc. The most common form of the machine is a cylindrical pipe enclosing a helix, inclined at a 45° angle to the horizontal with its lower end in the water. When the machine rotates, water rises through the pipe.
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"Archimedes' screw." World Encyclopedia. 2005. Encyclopedia.com. (May 25, 2012). http://www.encyclopedia.com/doc/1O142-Archimedesscrew.html

"Archimedes' screw." World Encyclopedia. 2005. Retrieved May 25, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-Archimedesscrew.html

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Archimedes screw images
Archimedes' screw. Wikimedia Commons (Public Domain)

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