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Summary
| Description |
English: Origional caption: "Fig. 38. Panel Long-wall in Oklahoma." Plan of a multi-panel advancing longwall mine, circa 1917, using a face conveyor and rail haulage. The figure has been altered by moving the scale and legend. |
| Date | 1917-06, |
| Source | Percentage of Extraction on of Bituminous Coal with Special Reference to Illinois Conditions, Engineering Experiment Station Bulletin No. 100, University of Illinois, page 131. |
| Author | C. M. Young |
Licensing
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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.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 16:54, 15 July 2009 | | 516 × 762 (94 KB) | Douglas W. Jones | {{Information |Description= {{en|Origional caption: "Fig. 38. Panel Long-wall in Oklahoma." Plan of a multi-panel advancing longwall mine, circa 1917, using a face conveyor and rail haulage. The figure has been altered by moving the scale and legend.} |
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