File:Periscope.png

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Diagram of periscope.


Source: Collier's New Encyclopedia, VII (New York: P.F. Collier & Son Company, 1921), p. 186.

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current07:05, 12 November 2004Thumbnail for version as of 07:05, 12 November 2004640 × 940 (33 KB)Moverton (talk | contribs)Diagram of periscope. From ''Collier's New Encyclopedia'' (1921)
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