| 单词 | long-wall |
| 释义 | > as lemmaslong-wall long-wall n. and adj. (and adv.) Coal Mining (usually attributive or as adj.) designating or relating to a method of mining in which the coal is worked in successive layers across the whole width of a face (rather than using a system of rooms and pillars); also occasionally as adv., worked using this method. ΘΚΠ society > occupation and work > industry > mining > [noun] > for coal > types of footrill1686 post and stall1793 long way1795 stall-work1811 long-wall1820 pitchwork1858 stoop-and-room1881 stonework1883 strait work1883 stumping1883 1820 Edinb. Encycl. (1830) XIV. 352/1 Under the fourth system of coal-mining, is that system named the Shropshire method, long way, or long wall. 1851 Official Descriptive & Illustr. Catal. Great Exhib. I. 149 The method of working coal, adopted in the Yorkshire mines generally, is that known as the long wall,..distinguished from the Newcastle, or pillar-and-stall method, by extracting at once all available coal. 1873 Trans. Amer. Inst. Mining Engineers 1871–3 1 175 Near Oldham the long-wall method has been in use since 1812. 1902 Blackwood's Edinb. Mag. Jan. 50/1 I worked the coal ‘long-wall’. 2001 High Country News 10 Sept. 2/3 Sieber took about 50 members of a local environmental group underground..to watch a $30 million longwall machine chew its way through a nine-foot-high coal seam. < as lemmas |
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