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 ...

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 ...

(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.

Make the most of January's new moon and survey the darkened skies with the best telescopes. Our guide will help you choose the right scope, no matter your budget or experience. Are you new to ...

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 ...

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 ...

In fact, the kind of travel telescopes that the big brands often sell are surely ... After all, as a refractor telescope it uses a lens to form an image so it’s necessary to stand behind the ...

I grew up studying astronomy the old-fashioned way – pointing my dad’s great big telescope upwards ... to the countryside to demo a new AI refractor telescope, the BeaverLAB Finder TW2.