The upper case is insulated from the conductive liquid, except at a hole in the insulation lying along {HEAD ~ a central axis} of the lower case and {TAIL ~ upper case} 
The upper case is insulated from the conductive liquid , except at a hole in the insulation lying along { HEAD ~ a central axis } of the lower case and { TAIL ~ upper case }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL