. St. Nicholas [serial]. FIG. 12, A BESSEMER CONVERTER BLOWING lOURING INTO A LADLE FROM AN OPEN-HEARTH FURNACE. carbon is the key-noteof them all. cementation. The cementation pro-cess is an old one, muchless used than formerly,but it gives a high gradeof steel, such as that usedin cutlery. Its operationis comparatively sim-ple and consists substan-tially in taking an ironbox, filling it with char-coal or carbon in whichare imbedded bars ofwrought-iron, the wholebeing subjected to long-continued high absorption ofthe carbon by the iron 1904.] THE STORY OF A BAR OF IRON. 439
. St. Nicholas [serial]. FIG. 12, A BESSEMER CONVERTER BLOWING lOURING INTO A LADLE FROM AN OPEN-HEARTH FURNACE. carbon is the key-noteof them all. cementation. The cementation pro-cess is an old one, muchless used than formerly,but it gives a high gradeof steel, such as that usedin cutlery. Its operationis comparatively sim-ple and consists substan-tially in taking an ironbox, filling it with char-coal or carbon in whichare imbedded bars ofwrought-iron, the wholebeing subjected to long-continued high absorption ofthe carbon by the iron 1904.] THE STORY OF A BAR OF IRON. 439 takes place and the process is continued to thedegree and amount desired. No great quantityof steel is made in this way. CRUCIBLE STEEL. The crucible process is quite an importantone, and large quantities of steel are made by it. It will be remembered that in the blast-fur-nace and cupola, exposure of the iron to theflame caused many substances and impuritiesto unite with it. The chief purpose of the crucible process isprotection of the steel from the action of t
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Keywords: ., bookauthordodgemar, bookcentury1800, bookdecade1870, bookyear1873
