{TAIL ~ The naturally rough finish} of step 46 and plate 48 provides that necessary gaseous communication between {HEAD ~ compartment} 50 and chamber 56, while preventing fly ash and other solid particles from rising into the upper chamber 56 
{ TAIL ~ The naturally rough finish } of step 46 and plate 48 provides that necessary gaseous communication between { HEAD ~ compartment } 50 and chamber 56 , while preventing fly ash and other solid particles from rising into the upper chamber 56
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH