Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . tliods are dry, wet, Iwt,etc. Otherwise classed, they may be criislitrs, grind-ers, stamps, mi/Is, etc. Or they may be sorters,which act by wet or dry processes to save t!ie morevaluable from the coarser particles; such are wasliers,jiggrrs, cradles, cojweiUrators, separators. Actingby heat, they may be blast, siiuiUitig, calcining, de-sulphurizing, oxidizing, r
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . tliods are dry, wet, Iwt,etc. Otherwise classed, they may be criislitrs, grind-ers, stamps, mi/Is, etc. Or they may be sorters,which act by wet or dry processes to save t!ie morevaluable from the coarser particles; such are wasliers,jiggrrs, cradles, cojweiUrators, separators. Actingby heat, they may be blast, siiuiUitig, calcining, de-sulphurizing, oxidizing, reducing, roasting quicksilver, they may be pans, barrels, amal-gamators, arrastras, etc. See under these heads andthe lists c|Uoted above. Ore-calcin-ing Furnace. A roasting furnacefor ores. One in which ore is reduced to a friablestate ; the heat at the same time, as with some ironores with argentiferous pyrites and many others,driving off certain volatile matters, such as sulphur,carbon, arsenic, phosphorus, antimony, etc. An furnace, which reduces the metal inthe ore to a metallic calx. Calcining or roasting Iurnaces are of various kinds :reverberatory, revolving on horizontal or vertical Fig. 3414,. ore and salt is fed. b, agitator-frames built into themasonry of the arch. The hearth c has a slightlyconical surface, and is made of fire-brick set on endon a cast-iron shidl. The bed / is also of refractoryclay. The furnaces g g are on each side, and theproducts of combustion, after traversing the flue,pass by the duct h to the chimney. After calcina-tion, the ores pass by the spont i to the clianiber stem of the hearth is step]icd in a block on thefloor of the crypt k, being revolved by the wheel andworm. See Kj3ASTING-furn.\ck ; Ore-concen-trator. {Mining.) A device tosort ores according to richness, or to separate themetallic portions of powdeied ores from the gangue. The processes are two, the dry and the wet. The dry is illust
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