Excerpt from Selective Radiation From the Nernst Glower
Of course the assumption is made that the emissivity function is similar to that of platinum and of a black body.' How far this assumption falls short of the observed facts is brought out in the present paper, in which i... t is shown that the observed radiation curve of a Nernst filament, which at high temperatures gives an apparently continuous spectrum, is in reality the composite of numerous sharp emission bands, which increase in intensity and broaden out with rise in temperature.
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