In the preferred embodiment, plate 48 is composed of a refractory material which conducts and reradiates {HEAD ~ heat} generated by {TAIL ~ heating elements} 38 
generated by
In the preferred embodiment , plate 48 is composed of a refractory material which conducts and reradiates { HEAD ~ heat } generated by { TAIL ~ heating elements } 38
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH