Construction of the first floor of a new wing of the Mount Wilson Observatory office building, Pasadena. Concrete bricks form the walls. An unidentified construction worker is seen working in front of the construction; he stands near a concrete mixer and bags of dry concrete. A portion of the existing office building is seen at the far left. A truck is parked between the existing building and the one under construction. Trees are seen in the distant background. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
Office buildings--Design and construction Buildings--California--Pasadena--Photographs Construction--California--Pasadena Construction workers--United States Concrete construction Concrete mixers Scaffolding Trucks Trees Mount Wilson Observatory Photographic prints. (gmgpc)
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