File:PSM V51 D168 Twelve inch cannon with closed breech mechanism.jpg

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English: Twelve inch cannon with closed breech mechanism
Date
Source Popular Science Monthly Volume 51
Author Unknown authorUnknown author
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This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Extracted image from book, to grayscale, cropped whitespace. Modifications made by Ineuw. The original can be found here: Popular Science Monthly Volume 51.

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current17:50, 28 April 2011Thumbnail for version as of 17:50, 28 April 20111,688 × 840 (209 KB)Ineuw (talk | contribs){{Information |Description = Twelve inch cannon with closed breech mechanism |Source = [http://www.archive.org/details/popularsciencemo51newy Popular Science Monthly Volume 51] |Date = 1897 |Author = Unknown |Permission

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