Transactions . fur-nace is limited to the time occupied by the ore-furnaces insmelting a charge of ore. The slag-furnace must always beready to treat the skim from the ore-furnace, which lattershould not be kept waiting. About three hours and a half areusually required for the smelting of a charge of about 12 tonsof ore. The method of cleaning the slag is as follows: the largeore-furnace being ready for skimming, the spout, which connectsit to the small auxiliary slag-furnace, is lowered in slag-furnace fireman then stands ready to direct the flowof slag onto the hearth of the lat
Transactions . fur-nace is limited to the time occupied by the ore-furnaces insmelting a charge of ore. The slag-furnace must always beready to treat the skim from the ore-furnace, which lattershould not be kept waiting. About three hours and a half areusually required for the smelting of a charge of about 12 tonsof ore. The method of cleaning the slag is as follows: the largeore-furnace being ready for skimming, the spout, which connectsit to the small auxiliary slag-furnace, is lowered in slag-furnace fireman then stands ready to direct the flowof slag onto the hearth of the latter. The two side skimming-doors of the ore-furnace are removed, and four skimmers taketurns at the skimming-rabbles, as before stated. After all theslag has been removed from the ore-furnace, that portion whichbecame chilled in the spout is at once pushed into the slag-fur-nace and the door closed. The fireman then stokes the fireand maintains a moderate heat for about an hour, which suffices <-\ —1-2-9--. L i;2^ -h PLAN AND HORIZONTAL SECTION
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
