The 24" Clark Telescope
Lowell Observatory, Flagstaff, AZ

Of the many telescopes found on Lowell Observatory’s central Flagstaff campus, the most prolific and recognizable is the Clark Refractor.... In the observatory’s earliest days, Percival Lowell himself used the Clark to study the surface of Mars, searching for signs of intelligent life. His theories on the subject fostered massive public interest in astronomy and sparked the imaginations of science fiction writers for generations to come. Nearly a century later, the Clark would be used by a team of scientists and artists to create painstakingly detailed maps of the Moon’s surface for use on the Apollo moon mission.
-from: https://lowell.edu/2020/09/17/the-unique-history-of-the-clark-telescope/

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