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 ( m) refractor telescope, the largest achromatic refractor ever pu

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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 ( 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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Keywords: 40, 1937, 40-, achromatic, america, american, astronomical, astronomy, bw, dome, historic, historical, history, largest, observatory, reflector, refractor, science, states, telescope, united, usa, wisconsin, yerkes