Building a better refractor The spyglass-turned-telescope had limitations ... light struck a secondary mirror Newton had affixed inside the tube at a 45-degree angle. That secondary mirror ...

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

FitzRandolph Observatory was constructed in 1934 to replace the Halsted Observatory. In 1966, a 36" reflecting telescope replaced the old 23" refracting telescope that had been in use since 1882.

The second floor consists of the Equatorial Room which is home to the star of McKim Observatory: a Clark Refracting Telescope with a 9.53” objective ... is the set of stairs shown in the picture.