The nozzle is formed of and defined by two moveable nozzle parts, the relative position of which determines the size of {HEAD ~ a discharge cross section} in {TAIL ~ the nozzle} 
The nozzle is formed of and defined by two moveable nozzle parts , the relative position of which determines the size of { HEAD ~ a discharge cross section } in { TAIL ~ the nozzle }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL