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Excerpt from Optical Methods in Control and Research Laboratories This is not surprising. Those departments of physics which deal with radiation and with the structure Of matter have, during the past twenty years, relied at every step on spectroscopy, both for the inspira tion and for the verification Of theory. 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.