100-inch telescope with tube nearly vertical, as seen from the west; Cassegrain cage attached to end of tube, Mount Wilson Observatory. The tube's mount is seen surrounding the tube but at an inclined angle; the higher end of the mount is seen at left on top of its pedestal. The interior walls of the domed observatory roof are seen in the background. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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