Arrival of the 100-inch telescope mirror at Mount Wilson Observatory. The large mirror is covered with a white tarpaulin, and is draped with an American flag. The mirror is in the back of a truck, which is parked outside the open doorway of the 100-inch telescope building. A crowd of unidentified men surrounds teh truck and the mirror. The observatory building is seen behind the mirror and the truck; the stairs leading to the exterior balcony part way up the domed roof are also visible. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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