Closeup of central section of the 100-inch telescope tube and fork, showing declination motor assembly, Mount Wilson Observatory. The telescope tube is vertical, with the fork angled around it. The declination motor assembly is seen behind the tube, near the central part of the tube. The interior walls of the observatory dome are 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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