The geography of the heavens and classbook of astronomy; (1863)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868, Whitall, Henry, 1819-1887? Celestial planisphere. [from old catalog] · New York, Mason brothers; Boston, Mason & Hamlin; [etc., etc.] · leaf 326
e is placed. 706. Cassegranian? Difference? Herschelian? Where 705. Newtonian reflectors?eye-piece ? How observer sit ? 324 ASTRONOMY. 707. The first telescope constructed upon this plan was thatby Sir William Herschel, in 1782. This was called his 20 feetreflector, and was the instrument with… … 708. The speculum of this instrument is 4 feet in diameter, o^inches thick, and weighed, before being ground, 2,118 pounds. 707. First Herschelian telescope? What called ? Next? 708. Herschels forty feett«fl«etor? Size of Specuiu-n? Weight? Tube? Length and weight? How mounted? DIFFERENT KINDS OF…
Constellations · Stars
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