Carnegie Steel Mill Opens

The Carnegie telescope is a twin 20-inch (510 mm) refractor telescope located at Lick Observatory in California, United States.^¹ The double telescope's construction began in the 1930s with a grant from the Carnegie institution, although it was not completed until the 1960s when a second lens was added.^¹ The telescope is not designed for visual observation, rather it has two lenses used for taking photographs for a specific wavelength recorded on a film emulsion.^¹ It was used for photographic sky surveys in the late 20th century, which were successfully completed.^¹