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loam and clay, and this innovation produced a finer finish on their brassware. In 1706 he started a new brass mill in the Baptist Mills area of Bristol. There, Darby realized that he could sell more kitchen wares if he could replace brass with a cheaper metal, namely, cast iron. Initial experiments to cast iron in sand molds were unsuccessful, but with the aid of one of his workers, James Thomas, a Welshman, he succeeded in casting iron cookware. In 1707 he obtained a patent for the process of

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