100-inch telescope tube and mount, nearly complete, Mount Wilson Observatory. The round base of the forked mount is seen in teh lower right-hand corner of the photograph; teh forked mount itself surrounds the tube. A curved ladder is seen at teh far right, reaching from the interior balcony to the top of the telescope tube. The interior walls of the dome are seen behind the tube. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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