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 ...

(For more on the controversy Galileo spawned, see His Big Mistake.) Building a better refractor The spyglass-turned-telescope had limitations, some of which Galileo was able to design around.

Save £26 on a refractor telescope that, with a 90mm aperture ... But as you can tell from these deals, you can still save big outside those events. However, if you're craving a serious step ...

The big news in March is the total lunar eclipse on March 13-14, so make sure you are ready to see the Blood Moon with one of these telescopes. You don't need to spend a fortune to make the most ...

McKim Observatory still houses many of its original instruments, including a 9.53 inch Clark Refractor telescope, a meridian transit telescope, and a gravity driven chronograph. Missing from the early ...

Refractor telescopes use specialised lenses to gather and focus light into an image, displaying a magnified sky view. In contrast, reflector telescopes use curved mirrors to reflect light onto the ...

What are the real advantages of big scopes? The larger the telescope's diameter, the more light it will collect. A 4-inch refractor, for example, is a great scope for planets, the Moon ...