Indian Science and Technology in the Eighteenth Century: Some Contemporary European Accounts c24.17
Indian Science and Technology in the Eighteenth Century: Some Contemporary European Accounts c24.17
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c24.17
14. The material used for the native furnaces, is the common red potter's clay of India, which unless carefully selected, is not generally very refractory, and will hardly stand a heat sufficient to fuse cast iron, but by mixing it with sand, and by concentrating the heat in the centre of the furnace as much as possible by a projecting blast pipe, the reduction of the ore is effected before the furnace has become much more than red hot; the operation being completed in about a couple of hours.