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Excerpt from Photoelectric Spectrophotometry by the Null Method Nevertheless, a method which eliminates any possible errors and the necessity of any tests, calibrations, or corrections due to these two factors is of much greater value and reliability than is any method into which these factors may enter. Instruments and Methods Used in Radiometry, III, Bureau of Standards Scientific Paper, No. 319. 1918. 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.