Heating coils 63 surround {TAIL ~ tube} 37 to heat {HEAD ~ tube} 37 to a desired temperature 
Heating coils 63 surround { TAIL ~ tube } 37 to heat { HEAD ~ tube } 37 to a desired temperature
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH