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provide some adequate procedures. In order to obtain some informations for this compensation, the melting points of several compositions of both Fe-Ni and Fe-Cu alloys were measured by use of twocolor pyrometer, and the characteristics, especially the spectral emissivity ratio for two different wave lengthsƒÃ1/ƒÃ2 of two-color pyrometer were discussed through this experimental result. The main results obtained were summarized as follows: 1) In liquid Fe-Ni alloy the value of ƒÃ1/ƒÃ2 decreased with increasing nickel concentration over all range of composition, while in liquid Fe-Cu alloy the ratio also decreased gradually up to about 60% Cu but abruptly above this composition with increasing copper concentration. These data seem to be useful as the practical coefficients converting from two-color temperature to true one for the both alloy systems. 2) In order to accurately measure the temperature of any kind of metals and alloys by two-color

An Experimental Analysis on the Temperature Measurement of Molten Iron and Iron Alloys by Two-Color Pyrometer