The air jet is introduced into {TAIL ~ the passageway} 28 from {HEAD ~ an angular passageway} J in FIG 2 
The air jet is introduced into { TAIL ~ the passageway } 28 from { HEAD ~ an angular passageway } J in FIG 2
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH