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 326
observe, another to work the tube, and a third to note down the observa-tions. A speaking tube runs from the observer to the house where the assistants are atwork. By this telescope, the sixth and seventh satellites of Saturn were discovered;and it was the chief instrument used by its distinguished… … T09. This is the largest reflecting telescope ever constructed.The speculum, composed of copper and tin, weighed three tons asit came from the mould, and lost about -Jth of an inch in grinding.It is 5^ inches thick, and 6 feet in diameter. It was cast onthe 13th of April, 1842, and was cooled…
Constellations · Stars
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