File:PSM V18 D538 Compound circles for astigmatism test.jpg

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Description Compund circles for astigmatism test
Date between 1880 and 1881
date QS:P,+1880-00-00T00:00:00Z/8,P1319,+1880-00-00T00:00:00Z/9,P1326,+1881-00-00T00:00:00Z/9
Source Popular Science Monthly Volume 18
Author Unknown authorUnknown author
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current05:08, 19 August 2010Thumbnail for version as of 05:08, 19 August 20101,098 × 1,049 (111 KB)Ineuw{{Information |Description = Compund circles for astigmatism test |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_18.djvu/538 |Date = 1880-1881 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} [[Category:P

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