Thomas and George Cranage
From Graces Guide
Furnacemen at Coalbrookdale
1766. They heated iron in a reverberatory furnace in such a way that it did not mix with coal and stirred it to encourage oxygeneration of the carbon took out a patent for converting pig iron into wrought iron.
Thomas and George Cranege developed the use of the reverberatory furnace for the production of wrought iron from cast iron.
Their experimentation using coal in 1766 at the Coalbrookdale iron works under the sponsorship of Richard Reynolds was a precursor to the work of Henry Cort, who further refined their techniques, together with those of Peter Onions, leading to his patent of 1784.
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