The original instrument to occupy the 25-foot diameter dome was the 10.5-inch Bausch refracting telescope (f/15.5) installed in the brand new observatory in 1953. Bausch & Lomb Company gave the ...

Then, drawing on his skills as a professor of ... underwent improvements in the coming centuries. Designers of refracting telescopes figured out, for one, that by using two different kinds of ...

Traditional refracting lenses use their curvature to bend light. The world-changing insight that inspired the telescope was ...