. Transactions of the Institution of Mining Engineers . Fig. 4.—Position of Cages, Guides, etc., in Shaft15 Feet in Diameter. Scale, 6 Feet to 1 Inch. as under :— Diameter of shaft, in feetNumber of tubs on each deck,, decks per cage,, guides in shaft„ rubbing-guidesTime per wind, in seconds 152282 50 1921-1922.] MITTON PIT-SHAFTS. 131 As the voliiiiie of airmaximum of 400,000cubic feet per minute,there would be sufficientarea in the two shaftsjust described for theproper ventilation ofthe mine as in the caseof the 18-foot shafts. Cost.—Estimating thecost of sinking throughthe New Red Sandston
. Transactions of the Institution of Mining Engineers . Fig. 4.—Position of Cages, Guides, etc., in Shaft15 Feet in Diameter. Scale, 6 Feet to 1 Inch. as under :— Diameter of shaft, in feetNumber of tubs on each deck,, decks per cage,, guides in shaft„ rubbing-guidesTime per wind, in seconds 152282 50 1921-1922.] MITTON PIT-SHAFTS. 131 As the voliiiiie of airmaximum of 400,000cubic feet per minute,there would be sufficientarea in the two shaftsjust described for theproper ventilation ofthe mine as in the caseof the 18-foot shafts. Cost.—Estimating thecost of sinking throughthe New Red Sandstoneat £350 per lineal yard,which would include thecost of sealing andcementing back thewater, and allowing forthe depth of water-bearing strata to besunk through as 200yards, it is then shownthat to sink two shafts15 feet in diameter for ventilating the mine is taken at a. Fig. 5.—Position of Cages, Guides, etc., inShaft 13 Feet in Diameter. Scale, 6Feet to 1 Inch. through the ordinary Coal-Measures to a total depth of 700 yards, after
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectmineralindustries
