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Blueprint for the 60-inch telescope and dome, Mount Wilson Observatory. The information in the lower right-hand of the blueprint reads:"60 Inch Reflector, Telescope, Dome and Building, Designer - G.W. Ritchey, Solar Observatory, Pasadena, Calif.". The scale is given below, in feet. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.