The Stephens observatory, located on the roof of Carnegie, houses a 12-inch Newtonian reflecting telescope, built by Roscoe G. Stephens of Kennebunk, Maine. Stephens gifted the telescope to the ...

Newton's reflecting telescope consisted of a single curved ... most major observatories are Newtonian reflectors. During the nascent years of the telescope, most devices were relatively small ...

Newtonian telescopes use a reflecting mirror to avoid the colour distortion and rainbow effect afflicting telescopes that use lenses. Finally, Newton discovered and defined calculus, the ...