File:The Quarterly journal of the Geological Society of London (13369133274).jpg

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

Original file ‎(1,853 × 3,186 pixels, file size: 1.01 MB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary

[edit]
Description

1872..
30LLAS — UPPER-GREENSASTD VENTRICULITES.
65
spherical bodies are found from yutt" to j^-" diameter, which agree
in their mineral characters with the opaque yellowish-brown fibre
of No. ii.
The Hexaradiate Elements. — The Ventriculite skeleton is formed by
the regular anastomosis of a number of hexaradiate elements, each
one of which consists of six radial fibres, apparently tubular,
diverging from a common centre at right angles to each other. To
the end of the first quarter of their course the fibres are of the most
microscopic diameter ; but they then suddenly expand, their diameter
becomes many times greater, and continues so to the end of their
entire course, where they open into the similar radii of surrounding
elements. At their point of expansion they give off four fibres of a
diameter of about 2 5 1 00 ", which pass backwards at an angle of about
45° to join similar fibres given off by the other arms of the same
element, so as to form a skeleton octahedron about the common
centre (fig. 2). This is the typical structure of the hexaradiate
Fig. 1.
Fis. 2.
B, radii.
r, interior radii.
o, spaces.
elements. As in the Vitrea, however, abnormalities occur, the ele-
ments sometimes becoming pseudo-heptaradiate (fig. 3), and some-
times apparently triradiate. The additional ray of the heptara-
diates is prolonged merely from one of the octahedral fibres, and
does not start from the common centre of the six normal rays.
The triradiates also have nothing in common with the hexaradiate
elements.
Combination of the Hexaradiate Elements. — Considering one of these
elements, it will be seen that each of its four horizontal radii is
freely continuous in the same straight line with a horizontal radius
furnished to it by one of four other elements symmetrically disposed
in the same plane around it ; each of the vertical radii is continuous
in the same way with a vertical radius derived from each of two
other elements, one placed above and the other below it : all the

VOL. XXIX. — PARTI. F
Date
Source https://www.flickr.com/photos/biodivlibrary/13369133274
Author Geological Society of London
Full title
InfoField
The Quarterly journal of the Geological Society of London.
Page ID
InfoField
39050969
Item ID
InfoField
120601 (Find related Wikimedia Commons images)
Title ID
InfoField
51125
Page numbers
InfoField
Page 65
Names
InfoField
NameFound:Ventriculites NameConfirmed:Ventriculites NameBankID:4390439 NameFound:Vitrea NameConfirmed:Vitrea EOLID:52703 NameBankID:2688242
BHL Page URL
InfoField
https://www.biodiversitylibrary.org/page/39050969
Page type
InfoField
Text
Flickr sets
InfoField
  • The Quarterly journal of the Geological Society of London. v. 29 (1873).
Flickr tags
InfoField
Flickr posted date
InfoField
24 March 2014
Credit
InfoField
This file comes from the Biodiversity Heritage Library.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.

العربية ∙ বাংলা ∙ Deutsch ∙ English ∙ español ∙ français ∙ italiano ∙ 日本語 ∙ македонски ∙ Nederlands ∙ polski ∙ +/−

The categories of this image need checking. You can do so here.
  • Please remove redundant categories and try to put this image in the most specific category/categories.
  • You can remove this template by clicking here (or on the first line).



Licensing

[edit]
w:en:Creative Commons
attribution
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by BioDivLibrary at https://flickr.com/photos/61021753@N02/13369133274. It was reviewed on 26 August 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

26 August 2015

This image is in the public domain because it is a mere mechanical scan or photocopy of a public domain original, or – from the available evidence – is so similar to such a scan or photocopy that no copyright protection can be expected to arise. The original itself is in the public domain for the following reason:
Public domain

This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.

This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.

This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

This tag is designed for use where there may be a need to assert that any enhancements (eg brightness, contrast, colour-matching, sharpening) are in themselves insufficiently creative to generate a new copyright. It can be used where it is unknown whether any enhancements have been made, as well as when the enhancements are clear but insufficient. For known raw unenhanced scans you can use an appropriate {{PD-old}} tag instead. For usage, see Commons:When to use the PD-scan tag.

Note: This tag applies to scans and photocopies only. For photographs of public domain originals taken from afar, {{PD-Art}} may be applicable. See Commons:When to use the PD-Art tag.

File history

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

Date/TimeThumbnailDimensionsUserComment
current10:33, 26 August 2015Thumbnail for version as of 10:33, 26 August 20151,853 × 3,186 (1.01 MB)Fæ (talk | contribs)== {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13369133274 | description = 1872.. <br> 30LLAS — UPPER-GREENSASTD VENTRICULITES. <br> 65 <br> sphe...

You cannot overwrite this file.

There are no pages that use this file.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:The_Quarterly_journal_of_the_Geological_Society_of_London_(13369133274).jpg&oldid=605980417"