The surface of the crucible 10 is covered by a housing 18 into which a reducing gas is introduced at an inlet 19 so as to flow generally contrary to the flow of {HEAD ~ metal} in {TAIL ~ the crucible} 10 which will thus be exposed to the reducing action of the gas 
The surface of the crucible 10 is covered by a housing 18 into which a reducing gas is introduced at an inlet 19 so as to flow generally contrary to the flow of { HEAD ~ metal } in { TAIL ~ the crucible } 10 which will thus be exposed to the reducing action of the gas
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