Scientists playing pool inside the Hooker cottage at Mount Wilson Observatory. Left to right are: Paul W. Merrill, Frederick E. Wright, Roscoe F. Sanford, and Ferdinand Ellermann. Three of the men are wearing suits, and all four are wearing eyeglasses. Three of the men are holding cues, and a rack of cues is visible on the wall behind Merrill. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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