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Excerpt from On the Computation of the Constant C2 of Planck's Equation by an Extension of Paschen's Method of Equal Ordinates If 7x is expressed in microns and 0 in centigrade degrees of the standard gas scale, the value of the constant 02 is in the vicinity of 14400, being apparently between 14600 and 14200. If 7t=o.7 which is about the limit of the visible red, the value of the factor in the parenthesis in equation (2) is about at the melting point of platinum; about at the temperature of the arc; and about at the apparent temperature of the sun. For decreasing wave lengths, these values approach unity rapidly. 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.

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