. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Fig. 24.—Guibal Ventilating Fan(End View).. Fig. 25.—Guibal Ventilating Fan(Side View). are erected have led to their being largely used for tunnelling and sinkingpurposes and the preliminary work of opening up a mine. For the permanent ventilation of a mine when the natural draughtis insufficient, the machine which has met with most favour is the Guibal,which is shown in figs. 24 and 25. The fan varies from 20 to 50 diameter, and has from 8 to 10 blades inclined backward
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Fig. 24.—Guibal Ventilating Fan(End View).. Fig. 25.—Guibal Ventilating Fan(Side View). are erected have led to their being largely used for tunnelling and sinkingpurposes and the preliminary work of opening up a mine. For the permanent ventilation of a mine when the natural draughtis insufficient, the machine which has met with most favour is the Guibal,which is shown in figs. 24 and 25. The fan varies from 20 to 50 diameter, and has from 8 to 10 blades inclined backwards and curvedat the tips, so interlaced as to form a structure of great strength. The Horse-power calculated on f-lb. pressure speed. o 6 MACHINERY FOR METALLIFEROUS MINES. air can enter at one or Ijoth sides. As a rule, one side is placed incommunication with the mouth of the shaft and the other is closed bya wall through which the axle of the fan passes, and is driven direct bya single cylinder engine. The general dimensions are given in the tableon page 37. The air is discharged at one particular place, to be determined by ex-periment and whi
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