Construction of the observatory dome for the 100-inch telescope building, Mount Wilson Observatory. A portion of a crane extends beyond the roof line of the dome itself. The steel framing for the dome is in place; the steel sheathing is seen just below the top of the dome. Scaffolding surrounds the concrete foundation and a portion of the dome framing. Trees and shrubs are in the surrounding area. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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