. Transactions . 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 There is in my possession one American pig with a perfectly whitecore, but such iron is rarely made in this country. We sometimespurchase iron which has a tendency to m
. Transactions . 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 There is in my possession one American pig with a perfectly whitecore, but such iron is rarely made in this country. We sometimespurchase iron which has a tendency to make stratified castings whenmixed with other irons, but usually the pig gives no indication ofsuch tendency. It can be overcome by varying the mixture.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
