. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. al ores, as the tin ores of Schlack-enwald in Bohemia, and at Ehrenfriedensdorf in Saxony, the arsenical pyrites of Geyer(in Saxony), &c., the chambers of condensation for the arsenious acid are much moreextensive than in the furnaces commonly used for roasting galena, copper, or even silverores. Figs. 686, 687, 688 represent a reverberatoi7 furnace employed in the smeltingworks of Lautenthal, in the Hartz, for roasting the schlichs of lead ores, which containmuch blende or sulphure
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. al ores, as the tin ores of Schlack-enwald in Bohemia, and at Ehrenfriedensdorf in Saxony, the arsenical pyrites of Geyer(in Saxony), &c., the chambers of condensation for the arsenious acid are much moreextensive than in the furnaces commonly used for roasting galena, copper, or even silverores. Figs. 686, 687, 688 represent a reverberatoi7 furnace employed in the smeltingworks of Lautenthal, in the Hartz, for roasting the schlichs of lead ores, which containmuch blende or sulphuret of zinc. In fig. 686 we see that the two parts A b, b c, areabsolutely like, the two furnaces being built in one body of brickwork. Fig. 687 isthe plan of the furnace b c, taken at the level e f o( fig. 686. Fig. 688 is a verticalsection of the similar furnace a b, taken in the prolongation of the line g h iafig. 687. METALLURGY. 829 a is the fire-place of the furnace, its grate and ash-pit. h is the conduit of vaporiza-tion, which communicates with the chambers c; c, chambers into which the vaporized. A B substances are deposited; d, chimney for the escape of the smoke of the fire-place a,after it has gone through the space b c c ; e, is the charging door, with a hook hanging in front to rest the long iron rake upon, with whichthe materials are turned over; /, chamber contain-ing a quantity of schlich destined for roasting; thischamber communicates with the vaulted corridor(gallery) d, seen in Jig. 686 ; g, orifice throughwhich the schlich is thrown into the furnace ; h,area or hearth of the reverberatory furnace, of whichthe roof is certainly much too high; i, channels forthe escai)e of the watery vapors; k, I, front arcade,between which and the furnace, properly speaking,are the two orifices of the conduits, which termi-nate at the channels m, m. m is the channel forcarrying towards the chimney d, the vapors whichescape by the door e. n is a walled-up door, whichis opened
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