. Transactions . this portion is half an inch of dark graphitic iron. The center ofthe slab is perfectly white for three-quarters of an inch in thick-ness, surrounded, as I have described, by perfectly gray iron, show-ing that, at a certain temperature, silicon and carbon will combinewith the iron and produce a white casting independently of any out-side chilling influence. In this exhibit are perfectly gray slabs ofthis brand, and also slabs perfectly white, all cast in the same kindof moulds. I was told that this stratification is of very common occurrencein Swedish iron, and that it is caus
. Transactions . this portion is half an inch of dark graphitic iron. The center ofthe slab is perfectly white for three-quarters of an inch in thick-ness, surrounded, as I have described, by perfectly gray iron, show-ing that, at a certain temperature, silicon and carbon will combinewith the iron and produce a white casting independently of any out-side chilling influence. In this exhibit are perfectly gray slabs ofthis brand, and also slabs perfectly white, all cast in the same kindof moulds. I was told that this stratification is of very common occurrencein Swedish iron, and that it is caused by the silicon content beingjust between that necessary for the production of gray and of whitel)ig. Being neither the one or the other, the stratified iron is con-sidered rather Fig. 5 represents another slab cast in an mould, and has a THE PHYSICS OF STEEL. 617 true chill at the bottom; next above this it is gray, then there comesa stratum of white patches with a gray stratum at the top. Fig. 6 is a slab cast in an iron mould with a true |-inch chill atbottom and sides. The top is gray for yVij^ch deep, then comes:|^-inch white below this, and the centre is gray for f-inch thickness.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
