This eliminates false readings due to downwardly descending soap film solution on the inside or {TAIL ~ the outside} of {HEAD ~ tube} 22 
This eliminates false readings due to downwardly descending soap film solution on the inside or { TAIL ~ the outside } of { HEAD ~ tube } 22
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH