File:PSM V24 D835 Explanation of the law of conjugate foci.jpg

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Description Explanation of the law of conjugate foci
Date between 1883 and 1884
date QS:P,+1883-00-00T00:00:00Z/8,P1319,+1883-00-00T00:00:00Z/9,P1326,+1884-00-00T00:00:00Z/9
Source Popular Science Monthly Volume 24
Author Unknown authorUnknown author
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