![File:Petardsketch.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/2/24/Petardsketch.jpg/800px-Petardsketch.jpg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 05:06, 6 March 2010 | ![]() | 2,175 × 1,362 (3.59 MB) | Durova | {{Information |Description=Illustration of camera obscura from "Sketchbook on military art, including geometry, fortifications, artillery, mechanics, and pyrotechnics" |Source=Library of Congress[http://lcweb2.loc.gov/cgi-bin/ampage?collId=rbc3&fileName=r |
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