File:Bulletin (1910) (14778845891).jpg

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English:

Identifier: bulletin190unit (find matches)
Title: Bulletin
Year: 1910 (1910s)
Authors: United States. Bureau of Mines
Subjects: Mines and mineral resources Mines and mineral resources Mining engineering
Publisher: Washington U.S. Govt. Print. Off. (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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About This Book: Catalog Entry
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Text Appearing Before Image:
In ventilating under these special conditions the slope is generallythe intake, and from it the air passes along the gangway to the inbyend, then up through the last counter to the chute or breast, in whichit is directed by a brattice to the working face, then down the otherside to the nearest crosscut, and so on out to the return airway. 34 COAL-MINING PROBLEMS IN THE STATE OF WASHINGTON.
Text Appearing After Image:
Admjid ujnjay* WESTERN WASHINGTON. 35 LONGWALL SYSTEM. The longwall system is always interesting, because of the completeextraction which it allows. An adaptation of this method within apanel was tried at one of the mines, as shown in Figure 18. Thebed in this place is about 6 feet in thickness, dips at an angle of 39°,and is immediately overlain by 27 feet of bone and carbonaceousshale, above which is a main roof of jointed sandstone 25 feet thick. This method is a modified chute and pillar system in connectionwith longwall. The gangway and first counter with the connectingchute were driven as usual, and the chutes or narrow breast werecontinued up the pitch. There are two blocks above the counter. Theupper end of the second block was cut at an angle of about 45° withthe direction of the chute, as shown in the figure, and the longwallface was started at this point and carried in steps 6 feet in lengtheach way. The loading chute was parallel with the longwall faceand was protected b

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Author United States. Bureau of Mines
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(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.
Volume
InfoField
190
Flickr tags
InfoField
  • bookid:bulletin190unit
  • bookyear:1910
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:United_States__Bureau_of_Mines
  • booksubject:Mines_and_mineral_resources
  • booksubject:Mining_engineering
  • bookpublisher:Washington_U_S__Govt__Print__Off___etc__
  • bookcontributor:Gerstein___University_of_Toronto
  • booksponsor:University_of_Toronto
  • bookleafnumber:53
  • bookcollection:gerstein
  • bookcollection:toronto
Flickr posted date
InfoField
30 July 2014
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31 August 2015

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current11:31, 7 September 2015Thumbnail for version as of 11:31, 7 September 20152,800 × 1,330 (751 KB)SteinsplitterBot (talk | contribs)Bot: Image rotated by 90°
09:10, 30 August 2015Thumbnail for version as of 09:10, 30 August 20151,330 × 2,804 (736 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{information |description={{en|1=<br> '''Identifier''': bulletin190unit ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=insource%3A%2Fbulletin190unit%2F find matches])<br...

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