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The 100-inch telescope inside its dome, Mount Wilson Observatory. Seen from the southwest, the tube is nearly upright, the shutter is open to the west. A curved ladder is seen at the far left. The interior balcony surrounds the telescope and its pedestal. The open shutter is seen at the top; the interior walls of the dome are seen in the background. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.