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Bessemer process - Wikipedia

Early history. A system akin to the Bessemer process has existed since the 11th century in East Asia. Economic historian Robert Hartwell writes that the Chinese of the Song Dynasty innovated a "partial decarbonization" method of repeated forging of cast iron under a cold blast.

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Probabilities Without Models | Slate Star Codex

Probably better than my rectally-placed intuition model… perhaps I should upgrade.

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_(Fanyijia )

(A) abrasive paper abrasive base paper absorbing paper ; account book paper

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Developments of Steelmaking Processes | ispatguru

Developments of Steelmaking Processes. The earliest known production of steel are pieces of ironware excavated from an archaeological site in Anatolia and are nearly 4,000 years old, dating from 1800 BCE (before common era).

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