Bausch & Lomb Company gave the University of Colorado a 10.5-inch refractor, formerly the property of Carl L. Bausch. The telescope was designed by George Saegmuller, a B&L designer, in 1912.

The Yerkes refracting telescope was gigantic for its time, with a main tube that's 60 feet long (18 m). A refracting telescope is one of the two main types of astronomical telescopes.

Traditional refracting lenses use their curvature to bend light. The world-changing insight that inspired the telescope was that two lenses in succession could be used to create enlarged images of ...

Home to the world’s largest refracting telescope, the Yerkes Observatory in Wisconsin was so influential that Albert Einstein insisted on visiting. Now you can too. Sometimes called “the ...