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