In {TAIL ~ this manner}, {HEAD ~ the atmosphere}, acting as a control pressure, is introduced into a variable pressure chamber defined within the housing 
In { TAIL ~ this manner } , { HEAD ~ the atmosphere } , acting as a control pressure , is introduced into a variable pressure chamber defined within the housing
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH