The geography of the heavens, and class-book of astronomy: accompanied by a celestial atlas (1873)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868, ed, Whitall, Henry, 1819-1887? Celestial planisphere · New York, Sheldon & company · leaf 338
nian reflectors? TIL, Cassegranian? Difference? Herschelian?eye-piece? How observer sit? 14* Where DIFFERENT KINDS OF TELESCOPES. 331 712. The first telescope constructed upon this plan was thatby Sir William Herschel, in 1*182. This was called his 20 feetreflector, and was the instrument with… … 713. The speculum of this instrument is 4 feet in diameter, 3.1inches thick, and weighed, before being ground, 2,118 pounds. 712. First Herschelian telescope ? Whatealled? Next? 713. Herschels fortv feetreflector? Size of Speculum? Weight? Tube? Length and Weight? Uow mounted ? 332 ASTRONOMY. The…
Constellations · Stars
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
