Charles I. Schrock standing with a 60-inch mirror blank at the Mount Wilson Observatory Optical laboratory, Pasadena. Schrock, dressed in a long white apron and white kerchief, is standing next to the mirror blank, behind the frame-like structure holding the mirror. Photograph taken in an interior room at the optical laboratory. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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