The size of {HEAD ~ discharge cross section} of {TAIL ~ the nozzle} varies through movement of the nozzle parts which respond to pressure created in the switch, without the assistance of elaborate compression springs 
of
The size of { HEAD ~ discharge cross section } of { TAIL ~ the nozzle } varies through movement of the nozzle parts which respond to pressure created in the switch , without the assistance of elaborate compression springs
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH