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<p>During the past few years several methods have been proposed for determining from experimental measurements the constants of Planck's equation for the distribution of energy in the spectrum of a uniformly heated enclosure or black body. The equation is E = /b c/ /sub 1/ lambda /sup -5/(/b e/(/sup c/sub 2// lambda thetas /)-1)/sup -1/, where E is a measure of the energy, lambda the wave-length, thetas the absolute temperature, /b c/ /sub 1/ a constant depending on the units in which E is measured and giving the scale of ordinates, and /b c/ /sub 2/ a constant which affects the shape of the curve and is sometimes called the "constant of spectral rad
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<br>Subjects: rays and radiation; thermodynamics; Heat flow, thermal and thermodynamic processes</div>
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