THE Yerkes Observatory, which has recently been completed and inaugurated, contains in its instrumental equipment the largest refractor in the world, the diameter of the object-glass spanning 40 ...

This was the first working reflecting telescope ... underwent improvements in the coming centuries. Designers of refracting telescopes figured out, for one, that by using two different kinds ...

Refracting telescopes use lenses - combining at least two, and as many as four, pieces of glass - as their objective (the primary light-gathering device). Reflecting telescopes use mirrors to ...

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 ...

FitzRandolph Observatory is located on the campus of Princeton University in Princeton, New Jersey. FitzRandolph Observatory was constructed in 1934 to replace the Halsted Observatory. In 1966, a 36" ...