Illustration of camera obscura from "Sketchbook on military art, including geometry, fortifications, artillery, mechanics, and pyrotechnics"
unknown, possibly Italian
Library of Congress<a rel="nofollow" class="external autonumber" href="http://lcweb2.loc.gov/cgi-bin/displayPhoto.pl?path=/service/rbc/rbc0001/2003/2003rosen1363&amp;topImages=0500r.jpg&amp;topLinks=0500v.jpg,0500u.tif,0500a.tif,0500.tif&amp;displayProfile=0">[1]</a> (image 500 of 601),<a rel="nofollow" class="external autonumber" href="http://catalog.loc.gov/cgi-bin/Pwebrecon.cgi?DB=local&amp;CMD=lccn+%2250032645%22&amp;CNT=10+records+per+page">[2]</a>