The mist discharge column 196 then moves back along {HEAD ~ the arc} 202 to its point of {TAIL ~ origin} 
The mist discharge column 196 then moves back along { HEAD ~ the arc } 202 to its point of { TAIL ~ origin }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL