This paper reviews some equiblast cupolas, and introduces emphatically the snail like wind box cupola.

本文评述了均匀送风冲天炉，并着重介绍蜗螺风箱冲天炉。

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Its question of an equiblast relates raising a molten iron temperature. In a sense, the history of cupola is just a history of searching an equiblast.

其均匀送风问题关系到铁水温度的提高，因而从一定意义上来说，冲天炉的历史就是不断寻求均匀送风的历史。

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