| 单词 | upcast shaft |
| 释义 | > as lemmasupcast shaft (or pit) a. upcast shaft (or pit), the pit-shaft by which the ventilating air of a mine is returned to the surface. ΘΚΠ society > occupation and work > workplace > places where raw materials are extracted > mine > [noun] > passage > ventilation passages or openings througher1645 thirling1686 air-pit1709 horse-head1747 sollar1778 airway1800 wind-hole1802 bearing door1813 air course1814 downcast shaft1814 upcast shaft (or pit)1816 buze1823 air road1832 raggling1839 thirl1847 brattice1849 intake1849 run1849 trapdoor1849 skailing1850 return1851 wind-road1860 breakthrough1875 wind-way1875 breast1882 cross-heading1883 skail-door1883 U.C.1883 undercast1883 vent1886 furnace-drift1892 1816 J. H. H. Holmes Treat. Coal Mines Durham & Northumberland 78 Ventilation..is accomplished by means of a stream of air which descends the Downcast Shaft and passes through the workings until it finds the Upcast Shaft, through which it ascends. 1839 A. Ure Dict. Arts 987 The air of the upcast pit being rarefied by the heat. 1867 W. W. Smyth Treat. Coal & Coal-mining 207 If a really large volume of air be required, we must heat the full height of the column in the upcast shaft. < as lemmas |
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