An exhaust annular gap is formed between {TAIL ~ the intermediate and outer cylinders} such that hot exhaust gases flow through the exhaust annular gap and heat is transferred from the hot exhaust gases to {HEAD ~ the cathode air stream} 
An exhaust annular gap is formed between { TAIL ~ the intermediate and outer cylinders } such that hot exhaust gases flow through the exhaust annular gap and heat is transferred from the hot exhaust gases to { HEAD ~ the cathode air stream }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD