Construction of the main floor of the 100-inch telescope foundation pier, Mount Wilson Observatory. Four (4) unidentified construction workers are seen at teh far side of the floor, three of them are near wheeled carts. The formwork for the concrete floor is in place. Trees are in the background. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
Construction--California Construction workers--United States Concrete construction--Formwork Framing (Building) Steel, Structural Floors Trees Mount Wilson Observatory Photographic prints. (gmgpc)
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