A method 1 operated as {HEAD ~ a continuous process} with metal oxide being provided to the crucible and recovered metal being collected at {TAIL ~ the lip} 
A method 1 operated as { HEAD ~ a continuous process } with metal oxide being provided to the crucible and recovered metal being collected at { TAIL ~ the lip }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL