Annual report of the State Mineralogist for the year ending ... . JCf^Z. 7>> J4c rial directly exposed to the cold blast). These may vary in length fromsix to eighteen inches, and prevent the burning through of this portionof the walls and of the nozzles themselves, which they also protectagainst the corrosive action of sulphurous acid. At the end of each tuyere is a glass-covered peep-hole, through whichthe condition of the interior may be watched in order to regulate theblast as required. If the temperature becomes too high the noses melt away, and if toolow they become unduly elongate
Annual report of the State Mineralogist for the year ending ... . JCf^Z. 7>> J4c rial directly exposed to the cold blast). These may vary in length fromsix to eighteen inches, and prevent the burning through of this portionof the walls and of the nozzles themselves, which they also protectagainst the corrosive action of sulphurous acid. At the end of each tuyere is a glass-covered peep-hole, through whichthe condition of the interior may be watched in order to regulate theblast as required. If the temperature becomes too high the noses melt away, and if toolow they become unduly elongated. Next, the regular smelting mixture is charged until the furnace isfilled to the top. The slag flows off in a continual stream down a longgutter of brasque. During its descent it cools off, and is thrown asidewith an iron fork. From time to time the furnace is tapped on either end, the lead andmatte flowing into shallow pots in the floor. The matte floats on thelead, and is removed by means of an eyebolt inserted before it tap-holes are placed in the
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Keywords: ., bookcentury1800, booksubjectgeology, booksubjectminesandmineralr
