On the computation of the constant Csub2 of Planck's equation by an extension of Paschen's method of equal ordinates . erely says that any two energy curves forblack body radiation may be made identical by plotting wavelengths in units which are proportional to the absolute temperatureof the black body emitting the radiation, and then changing thescale of the ordinate /. The change of vertical scale is given by XoojdXy of the curve is proportional to 6^. This requires that the ordinatesof corresponding points on two energy curves shall be in the ratio / ^Perhaps the clearest representation of
On the computation of the constant Csub2 of Planck's equation by an extension of Paschen's method of equal ordinates . erely says that any two energy curves forblack body radiation may be made identical by plotting wavelengths in units which are proportional to the absolute temperatureof the black body emitting the radiation, and then changing thescale of the ordinate /. The change of vertical scale is given by XoojdXy of the curve is proportional to 6^. This requires that the ordinatesof corresponding points on two energy curves shall be in the ratio / ^Perhaps the clearest representation of the substance of thesetwo laws is by a surface with X, /*, and 0 as its x, y, and z coordi-nates. As this surface is swept out by the energy curve, in the 4o6 Bulletin of the Bureau of Standards [Voi. 7, no. 3 form /*=<^(X), with changing 6, any point on the energy curvedescribes a curve which Hes in a plane containing the X axis. Allthe points on this curve correspond to one another. The pro-jection of this curve on the \ 0 plane is an equilateral hyperbolasince \B remains , April 26,
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