File:A high-school astronomy- in which the descriptive, physical, and practical are combined (1859) (14763914442).jpg

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Identifier: highschoolastro00matt (find matches)
Title: A high-school astronomy: in which the descriptive, physical, and practical are combined ..
Year: 1859 (1850s)
Authors: Mattison, Hiram, 1811-1868
Subjects: Astronomy
Publisher: New York, Mason brothers
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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ainted within and without. The length of the tube is 39 feet 4 inches, and its weight 8,260 pounds. It is elevatedor lowered by tackles, attached to strong frame-work; and the observer, who sits in achair at the upper end of the tube, and looks down into the reflector at the bottom, israised and lowered with the instrument. Three persons are necessary to use this tele-scope—one to 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 owner, in making the obser-vations and discoveries which have immortalized his name, and which have so abun-dantly enriched and advanced the science of astronomy. 536. HerschePs forty feet reflector ? Size of speculum ? Weight ? Tube 2Length and weight ? * How mounted? Observer where? Usefulness? 234 AFTTlONnMY.
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LORD ROSSK S OREAT REFLECTING TELESCOPE. 537. This is the largest reflecting telescope ever con-structed. The speculum, composed of copper and tin,weighed three tons as it came from the mould, and lostabout ;th of an inch in grinding. It is 5^ inches thick,and 6 feet in diameter. It was cast on the 13th of April,1842, and was cooled gradually in an oven for 16 weeks,to prevent its cracking, by a sudden or unequal reduc-tion of the temperature. This speculum has a reflectingsurface of 4,071 square inches. The tube is made ofdeal wood, one inch thick, and hooped with iron. Itsdiameter is seven feet, and its length 56. The entire weight of this telescope is twelve tons.It is mounted between two north and south walls, 24 feetapart, 72 feet long, and 48 feet high. The lower endrests upon a universal hinge. It can be lowered to thehorizon, and raised to the zenith, and lowered northwardtill it takes in the Pole star. Its motion from east towest is limited to 15 degrees. This magnificent ins

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  • bookid:highschoolastro00matt
  • bookyear:1859
  • bookdecade:1850
  • bookcentury:1800
  • bookauthor:Mattison__Hiram__1811_1868
  • booksubject:Astronomy
  • bookpublisher:New_York__Mason_brothers
  • bookcontributor:The_Library_of_Congress
  • booksponsor:The_Library_of_Congress
  • bookleafnumber:239
  • bookcollection:library_of_congress
  • bookcollection:americana
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28 July 2014
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