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File:The wonders of optics - Fig 45.png

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Gregorian Telescope.

Summary

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Description
English: Gregorian Telescope.
Date
Source https://en.wikisource.org/wiki/Page:The_wonders_of_optics_(1869).djvu/169
Author Fulgence Marion

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Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:The_wonders_of_optics_-_Fig_45.png

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