Mount Wilson Observatory's physical laboratory and optical shop, Pasadena. This is a view of the exterior of the building; a long row of windows covered by cloth awnings is predominanly seen. A wooden ladder rests against the building at the far left. Small trees and plants are planted in front of the building. A brick sidewalk is in the foreground in front of the building. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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