Which American astronomer enthusiastically amplified the concept of Martian canals, claiming to see thousands of them?

Answer

Percival Lowell

Percival Lowell, working from his private observatory in Flagstaff, Arizona, was captivated by the initial work and enthusiastically reported seeing thousands of artificial canals, solidifying the public obsession.

Which American astronomer enthusiastically amplified the concept of Martian canals, claiming to see thousands of them?
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