bosh

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bosh

1. the lower tapering portion of a blast furnace, situated immediately above the air-inlet tuyères
2. the deposit of siliceous material that occurs on the surfaces of vessels in which copper is refined
3. a water tank for cooling glass-making tools, etc

bosh

[bäsh]
(metallurgy)
Tapering lower portion of a blast furnace, from the blast holes of the hearth up to the maximum internal diameter at the bottom of the stack.
Quartz deposited on the furnace lining during the smelting of copper ore.