Image: Lanature1873 telescope gregory
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Description: Fig. 1. - Coupe du télescope de Grégory pour La Nature, revue des sciences, n° 18, page 279.
Title: Lanature1873 telescope gregory
Credit: http://cnum.cnam.fr/CGI/page.cgi?4KY28.1/287/100/p.279
Author: Unknown authorUnknown author
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