In the embodiment, a pressure sensor 56 is provided as an evaporation detector which detects the pressure inside the furnace 11, which is to input to the controller 20 not shown in FIG 7 as a detected signal of {TAIL ~ the oxygen} in proceeding of {HEAD ~ evaporation} 
In the embodiment , a pressure sensor 56 is provided as an evaporation detector which detects the pressure inside the furnace 11 , which is to input to the controller 20 not shown in FIG 7 as a detected signal of { TAIL ~ the oxygen } in proceeding of { HEAD ~ evaporation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD