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