Installation of steel reinforcing rods for the concrete floor of the foundation for the Hooker telescope building, Mount Wilson Observatory. Three (3) construction workers are clearly visible in teh foreground; a fouth man is in the background, standing behind a camera on a tripod. Trees are visible in the background. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
Bars (Engineering) Construction workers--United States Hoisting machinery Foundations Building--California Floors Building sites--California Cameras Trees Astronomical observatories Mount Wilson Observatory Photographic prints. (gmgpc)
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