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单词 set of timber(s
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set of timber(s
b. Mining. In full set of timber(s: A frame for supporting the side of a level or shaft, or the roof of a gallery.
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society > occupation and work > equipment > mining equipment > [noun] > pit supports
yoking1653
set1830
crib1839
tub1839
wedging crib1839
cribbing1841
ring crib1849
tack1849
tymp1883
1830 Gloss. Eng. Mining Terms (Cornwall) 22 in Q. Mining Rev. June Set of timber, a frame complete to support each side of the vein, level, or shaft.
1877 R. W. Raymond Statistics Mines & Mining 263 (note) The ‘set of timbers’ may perhaps be fairly assumed to represent 50 cubic yards of material removed.
1877 R. W. Raymond Statistics Mines & Mining 276 Replacing the old timbers with new square sets.
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