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<p>The luminosity of a radiator is defined as the integral from O to infinity with respect to lambda of the product of visibility (V) and energy (J) of the radiating source, /b i,e./ int /sub 0//sup infinity / VJ/b d/ lambda V = /b f/( lambda ) is given by the experimental determinations of Ives, Nutting, and Hyde and Forsythe, and J = /b c/sub 1// lambda /sup -5//b e//sup -c//sub 2//sup lambda thetas / (Wien's law). The effective wave-length lambda L of the luminosity has been defined analytically by Foote as lambda /sub L/ = int /sub 0//sup infinity / VJ/b d/ lambda / int /sub 0//sup infinity / (VJ/ lambda )/b d/ lambda . From this expression and that for L given above it is seen that- /b%
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<br>Subjects: photometry; rays and radiation; temperature; Heat flow, thermal and thermodynamic processes</div>
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