The ports 26 convey the admitted gas from the maximum diameter portion of {TAIL ~ the channel} 14 into the portion 23 which surrounds the section 31 of {HEAD ~ the nozzle} 30 
The ports 26 convey the admitted gas from the maximum diameter portion of { TAIL ~ the channel } 14 into the portion 23 which surrounds the section 31 of { HEAD ~ the nozzle } 30
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH