Yerkes Observatory, Wisconsin

Yerkes Observatory, Williams Bay, Wisconsin. Founded in 1892 by Charles Tyson Yerkes, the institution belongs to the University of Chicago. The big dome at the right houses the 40-inch (1.02 m) refractor telescope, the largest achromatic refractor ever put into practical astronomical use, while the smaller domes contain a 24-inch reflecting instrument and a 12-inch refractor

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Achromatic Astronomical Inch Observatory Reflector Refractor Telescope Wisconsin Yerkes

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