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Periscope
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==External links== {{Wikibooks|School Science|Demo periscope}} {{Commons}} * [https://web.archive.org/web/20071015135054/http://maritime.org/fleetsub/pscope/index.htm ''The Fleet Type Submarine Online: Submarine Periscope Manual''] United States Navy '''Navpers 16165''', June 1979 * [http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1348.0 ''Simulation of a Periscope''] at [http://www.phy.ntnu.edu.tw/ntnujava/index.php NTNUJAVA Virtual Physics Laboratory] * [https://www.petan.net/aviation/cn.htm Periscope used for Celestial Navigation in Petan.net] * [https://airfactsjournal.com/2014/09/navigating-old-days/ Air Facts] * [http://www.blackmanbooks.co.uk/navigation.html THE V-FORCE] * [http://www.sofajpl.com/airnav/index.html Air Navigation Periscope Sextants] * [https://www.e-pics.ethz.ch/index/ETHBIB.Bildarchiv/ETHBIB.Bildarchiv_466080.html Periscope Sextant in a Douglas DC-8] {{Authority control}} [[Category:Optical devices]] [[Category:British inventions]] [[Category:1902 introductions]] [[Category:Submarine components]]
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