100-inch telescope mirror at Mount Wilson Observatory, being unloaded from a truck. A group of men surround the truck and mirror, all of whom are wearing hats. One unidentified men is standing next to the mirror in the truck, removing the tarpaulin. The 100-inch telescope observatory building is seen behind the mirror and the truck; a ground-level door is open. Above the open doorway, a man sits on the exterior staircase below a large American flag. A second truck is parked next to the truck carrying the mirror. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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