. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. ses upona bed of brickwork c. Be-neath this there is a slagbottom d; e is the upper,and / the under dischargehole. The hearth is egg-shaped ; the longer axis be-ing 8 feet, the shorter 65feet; in the middle it is 10inches deep, and furnished with the outlets g g, which lead to each of the h,fig. 308. These outlets are contracted with fire-bricks i i, till the proper period ofthe discharge. The two hearths are placed in communication by a canal k: they are 3ifeet in
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. ses upona bed of brickwork c. Be-neath this there is a slagbottom d; e is the upper,and / the under dischargehole. The hearth is egg-shaped ; the longer axis be-ing 8 feet, the shorter 65feet; in the middle it is 10inches deep, and furnished with the outlets g g, which lead to each of the h,fig. 308. These outlets are contracted with fire-bricks i i, till the proper period ofthe discharge. The two hearths are placed in communication by a canal k: they are 3ifeet in diameter, 16 inches deep; are floored with well-beat coal ashes, and receive about27 cwt. for a charge. I is the grate; m, the fire-bridge; n, the boshes in which the tuyeres lie; 0, thechimney; p, the working door through which the slags may be drawn off. Abovethis is a small chimney, to carry off the flame and smoke whenever the door isopened. The smelting post or charge, to be purified at once, consists of 60 cwt. of blackcopper, to which a little granular copper and copper of cementation is added j the. COPPER. 333 consumption of pit-coal amounts to 36 cwt. As soon as the copper is melted, thebellows are set a-going, and the surface of the metal gets soon covered with a 308
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
