Interior of the west room of Mount Wilson Observatory's physical laboratory in Pasadena; taken from the southwest corner. This is possibly Arthur King's laboratory. Contained in the room are furnaces, spectroscopic equipment, magnets and a variety of other astronomical and optical instruments. The ceiling is corrugated sheet metal; interior brick walls are seen on the far walls. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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