In previous papers the author investigated the most important so-called constant, alpha , of spectral radiation of various metals, and it was found that the supposed constant had a temperature coefficient. This variability of alpha was subsequently explained by noting the fact that if the reflecting power (and hence the absorptivity) were uniform throughout the whole spectrum, the emission would be that of a "grey body." Hence the position of the max. emission lambda /sub max./ should shift uniformly with rise of temperature toward the shorter wavelengths and the intensity of the max. emission should increase according to the equation, E/sub max./ = BT/sup alpha /. But the reflecting power of metals has a temperature coefficient marked in the infra-red and decreasing to