longwall

English

long +‎ wall

longwall (plural longwalls)

(mining) A long wall of coal that is mined in a single slice.
- 1960, Colliery Guardian Overseas, page 50:
  In addition to its work on longwall faces, the A.B. Fifteen has been adapted for shortwall work either as undercutter or as overcutter, particular care having been taken to give it increased manoauvrability by the provision of special pulleys, and increased mobility by the addition of a tilting underframe.

单词	longwall
释义	longwall English Etymology long +‎ wall Noun longwall (plural longwalls) (mining) A long wall of coal that is mined in a single slice. 1960, Colliery Guardian Overseas, page 50: In addition to its work on longwall faces, the A.B. Fifteen has been adapted for shortwall work either as undercutter or as overcutter, particular care having been taken to give it increased manoauvrability by the provision of special pulleys, and increased mobility by the addition of a tilting underframe.
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