Transactions . east. Thereforeno apology on my part is required for the description I now give ofa complete gas assaying-plant. The illustration accompanying this paper is a faithful representa-tion of the group, as it was designed by, and arranged for myself,and appears in actual running order in my laboratory to-day. Itsduty is to do roasting, crucible-fusion, scorification and furnace at the left is for roasting sulphurets or other ores forexperimentation or actual work. It is what is known as a FletcherNo. 163, and consists of a fire-clay body strapped with sheet-ironbands,
Transactions . east. Thereforeno apology on my part is required for the description I now give ofa complete gas assaying-plant. The illustration accompanying this paper is a faithful representa-tion of the group, as it was designed by, and arranged for myself,and appears in actual running order in my laboratory to-day. Itsduty is to do roasting, crucible-fusion, scorification and furnace at the left is for roasting sulphurets or other ores forexperimentation or actual work. It is what is known as a FletcherNo. 163, and consists of a fire-clay body strapped with sheet-ironbands, and a burner (No. 16, Fletcher). The opening at the top A COMPLETE GAS ASSAYING-PLANT. 27 (protected when not in use by the cover shown) permits the heat tohave full play upon the roasting-dish placed on it. The heat andflame pass from the burner through the furnace, and out and up thechimney-pipe. The funnel-shaped pipe over the cover, is to catchand draw the fumes up the chimney. AVhen the burner is lighted,. a powerful draught ensues, carrying all odors and fumes at onceaway. Both the pipe and hood are provided with dampers, con-trolled by small weights. The burner is connected to the gas-tapby stout J inch rubber tubing. A cast-iron tripod supports one endof the furnace and keeps everything firm. Next in regular order (supposing a sulphuret ore to be undertreatment) is the middle furnace, for crucible-fusions. This, like- 28 A COMPLETE GAS ASSAYING-PLANT. wise, consists of a furnace and burner. The latter is a Fletcher , of the same construction, however, as the No. 16. The fur-nace proper is made in five parts, the central section (a cylinder offire-clay); the bed-plate upon which it rests and which has an open-ing for the flame to pass through ; the cover (with handle attached)which also has an opening filled by a plug—all of fire-clay; andfinally a plumbago lining. The rubber tube, chimney-connectionand damper are like those of the other furnace. Finally, at the
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
