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Excerpt from Wave-Length Measurements in the Arc and Spark Spectra of Zirconium In conclusion, it should be mentioned that the wave length 9277 A is not to be regarded as the termination of the observable spectrum of Zr. Previous work in this laboratory on Fe, Ti, Cr, and other elements 27 has shown that photographic plates sensitized with dicyanin are capable of recording spectra out to wave length 10000 A and beyond, with exposures of 10 or 12 hours duration. With the rarer elements such long exposures are not feasible. The analysis of the arc spectrum of Zr, referred to above, has led to the identification of many terms belonging to the quintet, triplet, and singlet series systems. From such terms the combination principles permit the calculation of wave lengths occurring in the spectrum. Thus the lines A, A, A, A, and A represent the term combinations 5f5 - 5g5, 5f4 - 5g5, 5f3 - 5g4, 5f2-5g3, and 5f1 - 5g2, respectively, andconstitute the principal members of the multiplet. The last three of these lines, as well as other near infra-red lines arising from different term combinations, were sought for on our plates but could not be found, and the failure to detect them must be attributed largely to the rapid falling off in sensitivity of the bathed plates between 9000 A and 10000 A. 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.