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 ...

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 ...

"If you want to take the stairs and walkways from the entrance of the ELT's dome all the way up to the top, you need about 30 minutes." ...

Established in 1897 by the University of Chicago, this historical site is home to the world's largest refracting telescope and has played a pivotal role in astronomical breakthroughs, including ...

Well, any of us who has ever looked through a telescope could say the same, for the two principal types in use today were developed by giants: the refractor by Galileo and the reflector by Newton.

It is also home to London's only planetarium, the Harrison timekeepers and the UK's largest refracting telescope.