Firstly, due to the downwardly reentrant attitude of tube 22, {HEAD ~ the exiting soap film solution} passes downwardly and outwardly of tube 22 and cannot flow back to {TAIL ~ the sensor assembly} 20 
not flow back to
Firstly , due to the downwardly reentrant attitude of tube 22 , { HEAD ~ the exiting soap film solution } passes downwardly and outwardly of tube 22 and can not flow back to { TAIL ~ the sensor assembly } 20
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH