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The Great Yerkes Telescope

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The Great Yerkes Telescope.jpg A Tubeless, or 'Aerial' TelescopeThumbnailsThe comet of 1066, as represented in the Bayeux TapestryA Tubeless, or 'Aerial' TelescopeThumbnailsThe comet of 1066, as represented in the Bayeux TapestryA Tubeless, or 'Aerial' TelescopeThumbnailsThe comet of 1066, as represented in the Bayeux TapestryA Tubeless, or 'Aerial' TelescopeThumbnailsThe comet of 1066, as represented in the Bayeux TapestryA Tubeless, or 'Aerial' TelescopeThumbnailsThe comet of 1066, as represented in the Bayeux TapestryA Tubeless, or 'Aerial' TelescopeThumbnailsThe comet of 1066, as represented in the Bayeux TapestryA Tubeless, or 'Aerial' TelescopeThumbnailsThe comet of 1066, as represented in the Bayeux Tapestry

Great telescope at the Yerkes Observatory of the University of Chicago, Williams Bay, Wisconsin, U.S.A. It was erected in 1896–7, and is the largest refracting telescope in the world. Diameter of object-glass, 40 inches; length of telescope, about 60 feet. The object-glass was made by the firm of Alvan Clark and Sons, of Cambridge, Massachusetts; the other portions of the instrument by the Warner and Swasey Co., of Cleveland, Ohio.