. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. tion shaft, called Breit-lingerweiterschacht; p is the extraction shaft, called Innier-schacht. E F, is a new extraction-shaft, called Neuer treibschacht,by which also the water is pumped up; by a b, and e f,the Avhole extraction and draining are carried on. Theores are raised in these shafts to the level of the wagon-gallery (galerie de rouJage) i, by the whims 1, g, providedwith ropes and buckets. 1, 2, 3, 4, fiig. 736, representthe positions of four water-wheels for working the w
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. tion shaft, called Breit-lingerweiterschacht; p is the extraction shaft, called Innier-schacht. E F, is a new extraction-shaft, called Neuer treibschacht,by which also the water is pumped up; by a b, and e f,the Avhole extraction and draining are carried on. Theores are raised in these shafts to the level of the wagon-gallery (galerie de rouJage) i, by the whims 1, g, providedwith ropes and buckets. 1, 2, 3, 4, fiig. 736, representthe positions of four water-wheels for working the whims;the first two being employed in extracting the ores, thelast two in draining. The driving stream is led to thewheel 1, along the drift /; whence it falls in successionupon the wheels 2, 3, 4, The general system of working consists of the followino-operation :— ° 1. The bed of ore is got at by the transverse galleries, m, n, o, q, r, s, which branchoff from the extraction shaft, and terminate at the wall of the main bed; 2. Great vaults are scooped out at the level of the workings, by means of fire j. 860 MINES. 2. Great vaults are scooped out at the level of the workings, by means of fire; 3. The roofs of these vaults are progressively propped with mounds of rubbish; 4. The ores thus detached, or by blasting with gunpowder, are then collected ; 5. Lastly, they are wheeled out to the day; and washed near z. Comparative Table of celebrated Mines in Europe and America. By F. Burr, Esq(Quarterly Mining Review for July^ 1835, p. 60.) SituationEleration Nature of the rock Nature of the me-talliferous deposits Produce of the ores lineral substance;accompanying- theores Depth of the princi-pal shafts Consolidated andUnited Mines. (At present the richestmines in Cornwall.) Two miles east of Redruth. Elevation of the surfaceabove the level ot thesea, from 200 lo 300 ft.;depth of the bottom ofthe mine below the levelof the sea, about 1,370feet. Primary clay slate restingimmedialel
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