Bessemer describes the converter to the British Association

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Henry Bessemer presents his process for making malleable iron and steel without fuel to the British Association at Cheltenham: air blown through molten pig iron burns out carbon and silicon, and the heat of that oxidation sustains the process. Combined with the later Siemens-Martin open-hearth route, it turns steel from a craft product into a bulk commodity. Architecture does not cause this and does not at first notice it.

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