Installation of reinforcing rods in the floor of the 100-inch telescope observatory dome, Mount Wilson Observatory. A construction worker is standing at the far end of the floor area, with parts of some of the construction equipment nearby. The steel rods and construction lumber are in the foreground. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
Bars (Engineering) Cranes, derricks, etc Hoisting machinery Construction projects Construction equipment Construction workers--United States Lumber Observatory domes Astronomical observatories Mount Wilson Observatory Trees Photographic prints. (gmgpc)
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