The new glass melting furnace offers the advantage that {HEAD ~ the thickness} of {TAIL ~ the sulfate layer} can be kept constant, regardless of the batch being fed in 
of
The new glass melting furnace offers the advantage that { HEAD ~ the thickness } of { TAIL ~ the sulfate layer } can be kept constant , regardless of the batch being fed in
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH