Supplementary Investigations of Infra-Red Spectra

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Excerpt from Supplementary Investigations of Infra-Red Spectra: Part V, Infra-Red Reflection Spectra, Part Vi, Infra-Red Transmission Spectra, Part VII, Infra-Red Emission SpectraThe Spectrometer slits were mm., or about 2' of arc, as in the preceding work. The radiation from a Nernst heater was projected upon the re¿ecting surfaces by means of a mirror having a focal length of 15 cm. And an aperture Of 12 cm.The re¿ection spectrum was explored by means of a Rubens thermo pile. Although its sensitiveness was greater than the radiometer used previously, the unsteadiness at times, due to magnetic disturbances, neces sitated repeating the Observations at each spectrometer setting. When using the radiometer, it was rarely necessary to repeat the Observations in exploring the spectrum up to 9 or IO p, while in the present work, using a thermopile, the region beyond 9 I: was examined under the greatest difficulties, and in the case of the carbonates no attempt was made to locate the band at 1 p. When the re¿ection faces were less than the standard size, 2 by 3 cm. Which was frequently the case, the silver com parison mirror and the specimen were covered with diaphragms having equal openings, so that equal areas of the two surfaces were exposed.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.