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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 it 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. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.