. Appleton's dictionary of machines, mechanics, engine-work, and engineering. ....Ji. More general than the foregoing are the blast-furnaces for smelting lead. These are furnaces resem-bling a cupola in which iron is smelted, more than any thing else; they are generally budt in a roughmanner in appearance, but the inside of the furnace coincides with a cupola; it is generally from six toeight feet high ; the blast is introduced by the nozzle h to the tuyere y. The lead, in gathering in thebottom /, is frequently tapped, so as to have but little metal in the furnace at a time. The cinder, orsla
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. ....Ji. More general than the foregoing are the blast-furnaces for smelting lead. These are furnaces resem-bling a cupola in which iron is smelted, more than any thing else; they are generally budt in a roughmanner in appearance, but the inside of the furnace coincides with a cupola; it is generally from six toeight feet high ; the blast is introduced by the nozzle h to the tuyere y. The lead, in gathering in thebottom /, is frequently tapped, so as to have but little metal in the furnace at a time. The cinder, orslag, is kept as high as the tuyere, and if it reaches too high some of it is tapped at a tap-hole in thefront of the furnace. One blast-furnace will produce in 24 hours about two tons of lead, for which itconsumes 6000 lbs. of galena, 25 bushels of charcoal, and about a quarter of a cord of wood. In thisoperation, as in the reverberatory, a great deal of metal is lost, which in most cases amounts to 20 percent, or more. The slags contain most of this loss, still a large portion of i
Size: 1056px × 2366px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
