File:Diaphragm Numbers.gif

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• 2011-02-12 07:13 Dicklyon 1646×954× (162467 bytes) higher-res cleaner scan from Google book search
• 2006-09-06 14:48 Boffy b 725×421× (63828 bytes) cropped out source info, added small, even white border
• 2006-07-14 06:47 Dicklyon 748×494× (67217 bytes) Blatant borrowing of David Stein's scan of an 1899 article. Photo Miniature, Vol. 1 No. 1, New York, April 1899. From [http://www.largeformatphotography.info/shutters.html]