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