Construction of a computer room addition at the base of the 150-foot tower telescope, Mount Wilson Observatory. Some of the steel framing for the new building is seen at the far right; lumber on the incomplete floor is seen below the framing. A small concrete mixer is seen just boyond the new building; a truck and an automobile are behind it. Trees line the road in the background. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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