. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. ide o the rush, along which the sharpend of a bit of stick is drawn, so as to extract the phj when the skin of the rush closesagain by its own elasticity. This tube is filled v with gunpowder, dropped into thevent-hole, and made steady with a bit of clay. AlPer smift, adjusted to burn a propeitime, is then fixed to the top of the rush-tube, ant^iidled, when the men of the mine re-tire to a safe distance. In fig. 709 the portion of the rock which -^ud be dislodged by the explosion, i
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. ide o the rush, along which the sharpend of a bit of stick is drawn, so as to extract the phj when the skin of the rush closesagain by its own elasticity. This tube is filled v with gunpowder, dropped into thevent-hole, and made steady with a bit of clay. AlPer smift, adjusted to burn a propeitime, is then fixed to the top of the rush-tube, ant^iidled, when the men of the mine re-tire to a safe distance. In fig. 709 the portion of the rock which -^ud be dislodged by the explosion, isthat included between a and e. The charge oPO^vder is represented by the white partwhich fills the hole up to c ; from which point*^ the top, the hole is filled with smift is shown at d. Fig. 711 is an iron bucket, or as it is cal^ Cornwall, a kibble, in which the oreis raised in the shafts, by machines callet-^^**? worked by horses. The best kibbles MINES. 843 are made of sheet-iron, and hold each about tliree hundred weight of ore : 120 kibblesare supposed to clear a cubic fathom of rock. 712. Fig. 712 represent the wheelbarrow used under ground for conveying ore and wasteto the foot of the shals. It is made of light deal, except the wheel, which has a narrowrim of iron. Fig. 713 represents Mr. Taylors ingenious ventilator, or machine for renewing freshair in iTiines. It is so Smple in construction, so complete in its operation, requires solittle power to work it, &id is so little liable to injury from wear, that nothing furtherof the kind can be desire\ in ordinary metallic mines. The shaft of the mine is repre-sented at A ; at either tht top or bottom of which the machine may be placed, as isfound most convenient, butthe foul air must be discharged into a floor, furnished witha valve-door to prevent its pturn into the mine, b is the air-pipe from the mine, pass-ing through the bottom of thv fixed vessel or cylinder c, which is formed of timber, andbound with ir
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