Excerpt from Absorption Spectra of Iron, Cobalt, and Nickel Approximately lines are observed in the arc emission spec trum of Ni, j and nearly 203 per cent of these were absorbed in our underwater ispark Spectra. A summary of the' classified absorption lines shows that 60 with intensity sum begin with a3f, 77 with total intensity 2 410 originate with a3d, and 15 with intensity totaling 200 have al-d as initial state. The levels of a3d are entirely encompassed by those of a3f, and 6319. Has the largest quantum numbers as well as the lowest energy level. Nevertheless, the a3d term appears to have considerable advantage ever the others ln the production of absorption lines. 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.