Sentence Examples


  • 1 Stage hoisting is applicable to any depth.
  • In deep shafts hoisting speeds of 3000 or 3500 ft.
  • In hoisting from great depths the weight of the rope, which may exceed that of the cage and FIG.
  • Tanks operated by the main hoisting engines, and of capacities up to 50o gallons or more, are applicable under several conditions: (1) When the shaft is deep, the quantity of water insufficient to keep a pump in regular operation, and the hoisting engine not constantly employed in raising mineral, the tank is worked at intervals, being attached temporarily to the hoisting rope in place of the cage.
  • The possibility of hoisting and pumping from great depths has been discussed, and it remains now to consider the other conditions which will tend to limit mining operations in depth - namely, increase of temperature and increase of rock pressure.