Yerkes 40-inch refractor telescope, 1896

Yerkes 40-inch refractor telescope, 1896

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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 being assembled. Construction workers (without safety belts, foreman at lower right) re-assembling the 40-inch refractor that was the centrepiece of 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. Here, the polar axis is being lowered into position. Photographed in October 1896.

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