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