After this, {HEAD ~ a constant current} is applied to the electrical heating wires 22 at {TAIL ~ a constant voltage} so as to split the cathode ray tube 6 along the electrical heating wires 22 
After this , { HEAD ~ a constant current } is applied to the electrical heating wires 22 at { TAIL ~ a constant voltage } so as to split the cathode ray tube 6 along the electrical heating wires 22
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH