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