Interior of completed physical laboratory at Mount Wilson Observatory, with circular concrete table in use. Several various instruments are seen on the concrete tables: a camera on the right-hand side with an extended lens, a mirror near the center, and other optical instruments. Windows in the walls are seen in the background and along the wall on the right-hand side. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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