A conduit 78 interconnects cannisters 72, 74 at {HEAD ~ the bottom} of {TAIL ~ one end} 
of
A conduit 78 interconnects cannisters 72 , 74 at { HEAD ~ the bottom } of { TAIL ~ one end }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL