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"Photograph of a reflecting telescope with silvered glass mirror of 1.20 metres at the Paris Observatory."

Science Museum Group, CC BY-SA 4.0 via Photograph of a reflecting telescope. 1884-23 Science Museum Group Collection Online. https://collection.sciencemuseumgroup.org.uk/objects/co56307/photograph-of-a-reflecting-telescope-photograph-telescope-reflecting

Color edits.

#telescope

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