{HEAD ~ A temperature sensor} 42 is provided in a furnace 11, measuring {TAIL ~ temperature} above a molten liquid 24 put in a crucible 12 to check proceedings of evaporation of oxygen vaporized from a free surface 44 of the molten liquid 24 
measuring
{ HEAD ~ A temperature sensor } 42 is provided in a furnace 11 , measuring { TAIL ~ temperature } above a molten liquid 24 put in a crucible 12 to check proceedings of evaporation of oxygen vaporized from a free surface 44 of the molten liquid 24
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