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