Periscope
From Wikimedia Commons, the free media repository
English: A periscope is a optical device for seeing things, but from another place or angle.
[edit] Drawings
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Principle
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Basic principle with mirrors or prisms
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Periscope lens
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Periscope with lenses and prisms
[edit] Photographs
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Submarine
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Soyuz 19
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Sniper with periscope rifle
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British soldier with periscope rifle
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World War 1 periscope
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Modern submarine periscope and Debbe Dunning
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A torpedoed Japanese destroyer as seen through the periscope of an American submarine
