100-inch telescope building under construction as seen from the 150-foot tower telescope, Mount Wilson Observatory. The steel framework for the exterior walls surrounds the concrete pier. Cranes and other machines are in the construction area. Trees surround the construction site; the San Gabriel Mountains 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 Foundations--Design and construction Concrete construction Steel framing (Building) Steel, Structural Cranes, derricks, etc Hoisting machinery Construction equipment Trees San Gabriel Mountains (Calif.) Mount Wilson Observatory Photographic prints. (gmgpc)
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