. Transactions . 50diam. A, B, C, Bessemer metal ; D, E, Thomas metal ; F, G, H, Open-hearth metal. 1, Inoriginal condition; 2, Heated and plunged into water; 3, Heated and slowly cooled ;4, Hardened and temper drawn. Plate II, The MicRosTRUCTiRE OF Ingot-Metal. From microphofographs taken by A. Martens, at the Royal Mechanico-Technical Experimental Station, Charlottenburg, Germany. A, MKideralely hard ; per cent, Halt-size. Halfyize. Tl ( \(ry liard ; per cent, carbon.

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries