Excerpt from Wave Lengths Longer Than 5500 an in the Arc Spectra of Seven Elements The 'wave lengths in the arc spectra of titanium, vanadium, chromium, manganese, molybdenum, tungsten, and uranium presented in this paper form a continuation of' the program of Standard wave-length. Determination and spectroscopic analysis inaugurated at the Bureau of Standards several years ago. This program has as one of its objects the mapping of the red and infra-red spectra of the chemical elements as far out into the region of longer wave lengths as modern photographic methods will permit. The values given below are submitted, therefore, not only as a description of the red and infra-red regions of the various spectra, but also to. Serve as starting values for the more precise determinations of interferometry. Similar results. For I 5 other elements have thus far been published.1 Work on others is in various stages of progress, and it is hoped that this phase of the program may be completed within a few years. 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.