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