At the bottom, sides and top, {TAIL ~ the bottom} 2, {HEAD ~ the side walls} 2 and the roof 2 of refractory material can again be seen 
At the bottom , sides and top , { TAIL ~ the bottom } 2 , { HEAD ~ the side walls } 2 and the roof 2 of refractory material can again be seen
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH