from The Century Dictionary and Cyclopedia
- n. A chamber or duct from which the separate twyer-pipes are led into the walls of the furnace proper.
- n. In the Bessemer converting vessel, the chamber below the refractory bottom from which air passes into the molded twyer-blocks and so up into and through the molten metal. Air is supplied to the box from a pipe leading down from the hollow trunnion of the converter.
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