The geography of the heavens, and class-book of astronomy: (1858)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 325
s placed. 705. Newtonian reflectors ? 706. Cassegranian ieye-piece? How observer sit? 14* Difference ? Herschelian ? Where 324 ASTRONOMY. TOT. 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… … 108. The speculum of this instrument is 4 feet in diameter, 8^inches thick, and weighed, before being ground, 2,118 pounds. 707. First Herschelian telescope? What called? Next? 708. Herschels forty feetreflector? Size of Speculum? Weight? Tube? Length and weight? How mounted? DIFFERENT KINDS OF…
Constellations · Stars
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
