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Excerpt from Practical Spectrographic Analysis The general characteristics of raies ultimes are, according to de Gramont, as follows: I. They are not necessarily the strongest or most brilliant spectral lines of the element to which they belong. 2. They persist even when strong self-induction (from to henry) is introduced in the condenser discharge circuit. They are present in the arc spectrum. 4. When the spectrum of an element furnishes lines which are spontaneously reversed, the raies ultimes are found among these. 5. They are found also in the spectra of ames. 6. In spectra whose lines have been arranged in series, they find their place as important series lines. The raies ultimes of the condensed spark may be considered as those which persist as the temperature decreases or as the elec trical energy of the luminous source diminishes. In other words, the diminution of concentration of an element modifies its spec trum in the same manner as a diminution in the vibratory energy of its atoms or electrons. Modern developments in the quantum theory of spectral line emission and recent experiments on atomic structure, the origin of radiation and the physical significance of spectral series have thrown much light on the subject of spectro graphic analysis and indicate that there is a sound. Physical basis underlying the empirical methods which have been mentioned above. A discussion of this, however, is presented in another paper (meggers, The Physical Basis for Spectrographic Analysis, B. S. Scientific Paper, forthcoming). For the present we Will limit ourselves to the purely empirical facts upon which practical spec trographic analysis has thus far been based. 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."