1820 engraving, "Dr. Herschel's Forty Feet Reflecting Telescope."
From Rees's Cyclopædia, or The New Cyclopædia, or, Universal Dictionary of the Arts and Sciences, edited by Reverend Abraham Rees (1743-1825). William Herschel's 40-foot telescope, also known as the Great Forty-Foot telescope, was a reflecting telescope constructed between 1785 and 1789 at Observatory House in Slough, England.
Size: 5884px × 6326px
Photo credit: © Old Paper Studios / Alamy / Afripics
License: Licensed
Model Released: No
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