The geography of the heavens : and class-book of astronomy : accompanied by a celestial atlas (1860)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868 · New York : Mason Brothers · leaf 327
placed. 705. Newtonian reflectors? 706. Cassegranian? Difference? Herschelian? Whereoye-piece? How observer sit ? 14* 324 ASTRONOMY. TOT. The first telescope constructed upon this plan was thatby Sir William Herschel, in 1*782. This was called his 20 feetreflector, and was the instrument with which… … 708. The speculum of this instrument is 4 feet in diameter, 3^inches thick, and weighed, before being ground, 2,118 pounds. 707. First Herechelian telescope? What called? Next? 708. Herschels forty feetreflector? Size of Speculum? Weight? Tube? Length and weight? How mounted? DIFFERENT KINDS OF…
Constellations · Stars
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