| 单词 | downcast shaft |
| 释义 | > as lemmasdowncast shaft 3. The ventilation shaft by which fresh air is introduced into a mine. Chiefly attributive, as downcast shaft, downcast pit, etc. 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 1814 J. Buddle 1st Rep. Soc. Preventing Accidents Coal Mines 8 Under the exhausting system the atmosphere always presses on the downcast shaft. 1859 Ann. Reg. 43 Worked by a single shaft, for both the ‘up-cast’ and the ‘down-cast’. 1874 Eng. Mechanic 23 Jan. 449/2 A temperature is maintained in the down-cast pit nearly equal to that of the atmosphere. 1920 Pennsylvania Bituminous Mine Inspector's Exam. (Mine Safety Appliances Company) 29 The temperature of the down cast is 40°. 1991 Nucl. Energy June 173/2 The downcast ventilation shaft—Konrad 1—is to be used for the transport of the iron ore excavated during the construction of the disposal rooms. 2002 Mining Mag. (Nexis) June 272 At Bosjesspruit, one upcast and one downcast shaft (both 7.1 m diameter) had to be sunk to a depth of 173 m. < as lemmas |
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