periscope

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periscope

periscope [Gr.,=view around], instrument to enable a person to see objects not in his direct line of vision or concealed by some intervening body. Its essential parts are a tube, prisms, lenses, mirrors, and an eyepiece. The image is received in one mirror and reflected through the tube with its lenses to a mirror visible to the viewer. Periscopes used in submarines are so arranged that they can be turned to permit a view of the entire horizon, with built-in rangefinders and typically six times magnification. Submarine periscopes are of noncorrosive metal, have tubes up to 30 ft (9.1 m) long and about 6 in. (15 cm) in diameter (only a small section projects above the water), and may be withdrawn into the submarine. Many smaller types of periscopes are used in trenches and tanks. With the development of fiber optics, periscopes (known as cystoscopes or endoscopes) have become useful in medicine.

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"periscope." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. 23 Dec. 2009 <http://www.encyclopedia.com>.

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periscope

The Concise Oxford Dictionary of English Etymology | 1996 | | Â© The Concise Oxford Dictionary of English Etymology 1996, originally published by Oxford University Press 1996. (Hide copyright information) Copyright

periscope XIX. f. PERI- + SCOPE.

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T. F. HOAD. "periscope." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 23 Dec. 2009 <http://www.encyclopedia.com>.

T. F. HOAD. "periscope." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (December 23, 2009). http://www.encyclopedia.com/doc/1O27-periscope.html

T. F. HOAD. "periscope." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved December 23, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-periscope.html

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	Periscope for the prairie. Newspaper article from: Wyoming Tribune-Eagle (Cheyenne, WY); 6/18/2007; 700+ words ; ...CHEYENNE -- A 42-foot-tall submarine periscope arrived at the Wyoming Air National Guard...for the Cheyenne Botanic Gardens, the periscope idea became a reality when it landed...would be neat for kids to look through a periscope and see what birds see from their perspective...
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