40-inch Refractor Telescope, Yerkes Observatory, 1897

A photograph from 1897 of the 40-inch (1.02 m) refractor telescope, at Yerkes Observatory, in Williams Bay, Wisconsin, the largest achromatic refractor ever put into practical astronomical use. Founded in 1892 by Charles Tyson Yerkes, the institution belongs to the University of Chicago

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Achromatic Astronomical Inch Observatory Refractor Telescope Wisconsin Yerkes

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