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<p>The present paper gives data relating principally to the determination of the mathematical form of the isothermal spectral curve of a black body, and to the computation of the numerical value of the constants relating thereto, for the temperature-range between 450 degrees and 1525 degrees C. The paper also contains data on various subsidiary problems such as (i) the variations of the reflecting power of silver with angle of incidence and with wave-length, (ii) the variation of the reflecting power of fluorite with angle of incidence and with wavelength, (iii) data on the most reliable refractive indices of fluorite, reduced to 20 degrees C., and (iv) data for reducing the observations
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<br>Subjects: measurements and use of instruments; rays and radiation; Heat flow, thermal and thermodynamic processes</div>
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