File:LongwallOld.png
From Wikimedia Commons, the free media repository
Jump to navigation
Jump to search
Size of this preview: 442 × 599 pixels. Other resolutions: 177 × 240 pixels | 354 × 480 pixels | 738 × 1,000 pixels.
Original file (738 × 1,000 pixels, file size: 133 KB, MIME type: image/png)
File information
Structured data
Captions
Summary
[edit]DescriptionLongwallOld.png |
English: Original caption: "Fig. 24. -- Plan of individual roadway longwall mine." The three-compartment hoisting shaft is in the center of the central pillar, which is not mined in order to avoid subsidance around the hoist. The downdraft ventilation shaft is 100' left of the pillar. Arrows show directions of air flow. Access to the face is through roadways through the gob, protected by packwalls, and with the roof "brushed" to maintain clearance as the roof subsides. |
Date | |
Source | Coal Mining Methods in Missouri, School of Mines and Metallurgy Bulletin, Vol. 5, No. 4, University of Missouri, Rolla |
Author | William Walbridge Weigel |
Licensing
[edit]Public domainPublic domainfalsefalse |
This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
|
||
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
|
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 15:15, 2 July 2009 | 738 × 1,000 (133 KB) | Douglas W. Jones (talk | contribs) | {{Information |Description={{en|1=Original caption: "Fig. 24. -- Plan of individual roadway longwall mine." The three-compartment hoisting shaft is in the center of the central pillar, which is not mined in order to avoid subsidance around the hoist. T |
You cannot overwrite this file.
File usage on Commons
The following page uses this file:
File usage on other wikis
The following other wikis use this file:
- Usage on en.wikipedia.org
- Usage on www.wikidata.org