The withdrawal section is separated from the melting section by {HEAD ~ a first dividing wall} extending downwardly and terminating above {TAIL ~ the surface} of the molten glass 
extending downwardly
The withdrawal section is separated from the melting section by { HEAD ~ a first dividing wall } extending downwardly and terminating above { TAIL ~ the surface } of the molten glass
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH