. Transactions. z o o (/) 2,80 2,40 carbon, per 4.—Analyses op Bars, Tested for Tensile Strength. \ Bar No. Tensile Strength, Pounds per Square Inch Elongation,Per Cent. Silicon,Per Cent. Carbon,Per Cent. 123456 43,68044,77048,34049,71049,44048,080 These test bars were round, in. in diameter for 2 in. in themiddle, and enlarged at the ends for gripping. A shrink ball was caston one end to insure soundness. The structure of t

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. Transactions. z o o (/) 2,80 2,40 carbon, per 4.—Analyses op Bars, Tested for Tensile Strength. \ Bar No. Tensile Strength, Pounds per Square Inch Elongation,Per Cent. Silicon,Per Cent. Carbon,Per Cent. 123456 43,68044,77048,34049,71049,44048,080 These test bars were round, in. in diameter for 2 in. in themiddle, and enlarged at the ends for gripping. A shrink ball was caston one end to insure soundness. The structure of two of these bars isshown in Figs. 5 and 6. No. 1, the weaker bar, shows slight inclinationto graphitic structure in the shape of the carbon particles. The nearest approach that I have noticed to the co-ordination of VOL. LIII. -13 194 THE CONTROL OF CHILL IN CAST IRON such valuable facts as are above outlined is the paper published in theProceedings of the American Foundry mens Association, a couple of years. Fig. 5.—Structure of Bar No. 1, Magnified 50 Diamictkiw.

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries