The tubing member is then restricted, a combustion supporting atmosphere introduced therein, and {HEAD ~ the second open end} of {TAIL ~ the tubing member} is sealed to define the finished envelope 
of
The tubing member is then restricted , a combustion supporting atmosphere introduced therein , and { HEAD ~ the second open end } of { TAIL ~ the tubing member } is sealed to define the finished envelope
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH