{TAIL ~ The swirling stream} of air circulates about the common axis of {HEAD ~ the nozzles} 20, 30 and centering surfaces 25, 34 
{ TAIL ~ The swirling stream } of air circulates about the common axis of { HEAD ~ the nozzles } 20 , 30 and centering surfaces 25 , 34
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH