100-inch telescope observatory dome, under construction, Mount Wilson Observatory, as seen from the south. The steel framing for the dome is in place; sheathing covers most of the dome. A portion of a crane is seen above the roof line of the dome. Scaffolding surrounds the concrete foundation of the building. 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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