Clipart tagged: ‘reflecting telescope’
!["These telescopes were all reflectors; that is, instead of looking up at a star through a tube with a glass in the upper end [Herschel] would look down into the tube away from the star and see its reflecting in a concave mirror at the lower end of the tube."—The Foundation Library, 1911](https://etc.usf.edu/clipart/79400/79403/79403_telescope_mth.gif)
A Great Reflecting Telescope
"These telescopes were all reflectors; that is, instead of looking up at a star through a tube with…
"These telescopes were all reflectors; that is, instead of looking up at a star through a tube with…