Grace's Guide

British Industrial History

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 149,257 pages of information and 234,233 images on early companies, their products and the people who designed and built them.

Thomas and George Cranage

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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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