Construction of the second story of the new wing of Mount Wilson Observatory's office building, Pasadena. Seen here is crane positioning pre-stressed concrete slab floor for the second story, as seen from the second story of the old building. Two unidentified construction workers position into place large slabs of pre-stressed concrete into iron framing. The roof of a building behind them is seen in the 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 Construction--California--Pasadena Concrete construction Construction workers--United States Steel framing (Building) Cranes, derricks, etc Hoisting machinery Roofs Trees Photographic prints. (gmgpc)
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