File:Popular science monthly (1872) (14596576308).jpg

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Identifier: popularsciencemo89newyuoft (find matches)
Title: Popular science monthly
Year: 1872 (1870s)
Authors:
Subjects: Science
Publisher: New York : D. Appleton
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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About This Book: Catalog Entry
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all keyboards con\enientIyplaced for the observer to use. An im-portant part of the gearing is the clock-work, which carries the telescope with therotation of the heavens, so that a star canbe kept in the field of view as long as isdesired. This must be made so that thetelescope moves with absolute steadiness.The optical parts of the instrument arebeing made by Brashear at Allegheny.The large mirror is twelve inches thick atthe edges and will weigh over four thousandpounds. What Good is a Reflecting Telescope? Ha\ing thus given somewhat in detailthe construction of the reflecting telescope,it remains to describe the work which canmost satisfactorily be done with it. First,it is used for direct photograjjln, both forrecording very faint objects and for gettingfine details of brighter objects, such asnebulae. This is perhaps the use whichappeals most directly to the general reader.We can also get the photographic images ofvery faint stars, the twentieth magnitude Popular Science Monthly
Text Appearing After Image:
Mounting of the seventy-two-inch reflector of the Dominion Observatory of Canada, to beinstalled at Victoria, British Columbia. The principles of construction are the same what-ever the size of the instrument, but the great weight of a large reflector makes the engineeringproblem a difficult one. The weight of the mirror cell with the mirror is six tons. The polar axiswhich is bolted to the pierheads, weighs ten tons. The skeleton tube weighs two tons. Thedotted lines represent the path of the rays of light. The polar axis must be set parallel to theaxis of rotation of tiic earth. In the latitude of Victoria, it makes an angle of more than forty-eight degrees with the horizon Popular Science Mo)if/il!/ mi

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  • bookid:popularsciencemo89newyuoft
  • bookyear:1872
  • bookdecade:1870
  • bookcentury:1800
  • booksubject:Science
  • bookpublisher:New_York___D__Appleton
  • bookcontributor:Gerstein___University_of_Toronto
  • booksponsor:University_of_Toronto
  • bookleafnumber:923
  • bookcollection:toronto
  • BHL Collection
Flickr posted date
InfoField
30 July 2014


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