{HEAD ~ The hot water} in {TAIL ~ the tank} is maintained at a constant level so that the quantity of water discharged by the dipper is fixed 
in
{ HEAD ~ The hot water } in { TAIL ~ the tank } is maintained at a constant level so that the quantity of water discharged by the dipper is fixed
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH