File:LongwallOld.png
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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)
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 15:15, 2 July 2009 | | 738 × 1,000 (133 KB) | commons>Douglas W. Jones | {{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 |
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