Construction of a computer room addition at the base of the 150-foot tower telescope, Mount Wilson Observatory. This view looks at the new building's frame from above. A small portion of the tower's base is seen at the far left. The flooring for the new building is not yet installed, making a portion of the foundation visible. Several pieces of construction equipment are seen in the area, including a wheelbarrow, a ladder and a truck. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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