Yerkes 40-inch refractor, 20th century

Yerkes 40-inch refractor, 20th century

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Credit: Yerkes Observatory, University of Chicago, courtesy EMILIO SEGRE VISUAL ARCHIVES/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: Yerkes 40-inch refractor telescope in its dome at the Yerkes Observatory, Williams Bay, Wisconsin, USA. This 40-inch refractor telescope was the largest of its kind in the world. Made by Warner and Swasey of Cleveland, Ohio, USA, it was exhibited at the 1893 Columbian Exposition and then later installed at the Yerkes Observatory (opened 1897), founded by George Hale with a grant from businessman Charles T. Yerkes. This view dates from before the changes made at the Observatory in the mid-1970s. The dome (27 metres wide and 18 metres high, on brick walls), here open for observations, was also made by Warner and Swasey.

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