File:Astronomy for the use of schools and academies (1882) (14783980773).jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file ‎(2,864 × 1,832 pixels, file size: 2.17 MB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary[edit]

Description
English:

Identifier: astronomyforuseo00gill (find matches)
Title: Astronomy for the use of schools and academies
Year: 1882 (1880s)
Authors: Gillet, J. A. (Joseph Anthony), 1837-1908 Rolfe, W. J. (William James), 1827-1910
Subjects: Astronomy
Publisher: New York : Potter, Ainsworth, & Co.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
Fig. 26. The Cassegrainian Reflector. — In principle this is thesame with the Gregorian ; but the small mirror, R, is con-vex, and is placed inside the focus, F, so that the rays arereflected from it before reaching the focus, and no imageis formed until they reach the opening in the large mirror.This form has an advantage over the Gregorian, in that the 24 ASTRONOMY.. telescope may be made shorter, and the small mirror canbe more easily shaped to the required figure. It has, there-fore, entirely superseded the original Gregorian form.
Text Appearing After Image:
Optically these forms of telescope are inferior to theNewtonian ; but the latter is subject to the inconvenience,that the observer must be stationed at the upper end ofthe telescope, where he looks into an eye-piece screwedinto the side of the tube. ASTRONOMY. 25 ()n the other hand, the .Cassegrainian Telescope is pointeddirectly at the object to be viewed, like a refractor; and theobserver stands at the lower end, and looks in at the open-ing through the large mirror. This is, therefore, the mostconvenient form of all in management.

Note About Images

Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.
Date
Source

https://www.flickr.com/photos/internetarchivebookimages/14783980773/

Author Internet Archive Book Images
Permission
(Reusing this file)		 At the time of upload, the image license was automatically confirmed using the Flickr API. For more information see Flickr API detail.
Flickr tags
InfoField
  • bookid:astronomyforuseo00gill
  • bookyear:1882
  • bookdecade:1880
  • bookcentury:1800
  • bookauthor:Gillet__J__A___Joseph_Anthony___1837_1908
  • bookauthor:Rolfe__W__J___William_James___1827_1910
  • booksubject:Astronomy
  • bookpublisher:New_York___Potter__Ainsworth____Co_
  • bookcontributor:The_Library_of_Congress
  • booksponsor:The_Library_of_Congress
  • bookleafnumber:41
  • bookcollection:library_of_congress
  • bookcollection:americana
Flickr posted date
InfoField
28 July 2014

Licensing[edit]

This image was taken from Flickr's The Commons. The uploading organization may have various reasons for determining that no known copyright restrictions exist, such as:
  1. The copyright is in the public domain because it has expired;
  2. The copyright was injected into the public domain for other reasons, such as failure to adhere to required formalities or conditions;
  3. The institution owns the copyright but is not interested in exercising control; or
  4. The institution has legal rights sufficient to authorize others to use the work without restrictions.

More information can be found at https://flickr.com/commons/usage/.

Please add additional copyright tags to this image if more specific information about copyright status can be determined. See Commons:Licensing for more information.
This image was originally posted to Flickr by Internet Archive Book Images at https://flickr.com/photos/126377022@N07/14783980773. It was reviewed on 3 August 2015 by FlickreviewR and was confirmed to be licensed under the terms of the No known copyright restrictions.

3 August 2015

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current23:01, 19 December 2015Thumbnail for version as of 23:01, 19 December 20152,864 × 1,832 (2.17 MB)SteinsplitterBot (talk | contribs)Bot: Image rotated by 90°
00:36, 3 August 2015Thumbnail for version as of 00:36, 3 August 20151,832 × 2,864 (2.07 MB)Fæ (talk | contribs)== {{int:filedesc}} == {{subst:chc}} {{information |description={{en|1=<br> '''Identifier''': astronomyforuseo00gill ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=insource%3A%2Fastronomyforuse...

You cannot overwrite this file.

There are no pages that use this file.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:Astronomy_for_the_use_of_schools_and_academies_(1882)_(14783980773).jpg&oldid=805753681"