. Transactions . om the gray iron about them. Ananalysis of the beads (accompanied by a considerable amount of ad-hering gray iron) gave C, ; Si, ; P, ; S, ; Mn, The gray iron alone contained C, ; Si, ; P, ;S, ; Mn, The following cases (Figs. 3, 4, 5 and 6) ofstratification could be seen at the Exposition in the iron-exhibit inthe Swedish Building. Swedish pigs are cast in an iron pig-bed,and quite often in the form of slabs from 8 to 10 inches wide, andabout a foot and a half long. These figures are drawn to a scaleof four-tenths of an inch to
. Transactions . om the gray iron about them. Ananalysis of the beads (accompanied by a considerable amount of ad-hering gray iron) gave C, ; Si, ; P, ; S, ; Mn, The gray iron alone contained C, ; Si, ; P, ;S, ; Mn, The following cases (Figs. 3, 4, 5 and 6) ofstratification could be seen at the Exposition in the iron-exhibit inthe Swedish Building. Swedish pigs are cast in an iron pig-bed,and quite often in the form of slabs from 8 to 10 inches wide, andabout a foot and a half long. These figures are drawn to a scaleof four-tenths of an inch to one inch, and represent a fractureacross the center of a slab. The brand-mark is shown alongsidethe cut. Fig. 3 shows an iron capable of taking a chill, as shown by thewhite stratum at the bottom. The cooling was so rapid that hardlyany of the carbon could take the graphitic form. At the top of the 616 THE PHYSICS OF STEEL. slab, where cooling was less rapid, graphite formed, giving a stratumof gray iron. FiG. Fig. 4 represents a slab which I am told positively was cast in aniron-bed. In spite of the cooling influence of the mould, the lowershell for one-eighth of an inch is gray, the temperature being thatrequired for the formation of graphite. The upper surface exposedto the air is very light-colored, and is full of white spots. Beneath Rg. 4.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
