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 ...

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.

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.