Excerpt from Atlas of Absorption Spectra A great deal of experimental work was necessary before satisfactory photographic records were obtained. The details of the spectrograph and the refinements of the method have been worked out very skilfully by Dr. Uhler, who has done practically all of the experimental work. It was our original plan to include the colored salts of metals, and to examine a large number of colorless substances for peculiarities in the ultra-violet. The solutions of the inorganic compounds could not, ...
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Excerpt from Atlas of Absorption Spectra A great deal of experimental work was necessary before satisfactory photographic records were obtained. The details of the spectrograph and the refinements of the method have been worked out very skilfully by Dr. Uhler, who has done practically all of the experimental work. It was our original plan to include the colored salts of metals, and to examine a large number of colorless substances for peculiarities in the ultra-violet. The solutions of the inorganic compounds could not, however, be investigated in precisely the same manner, owing to their less powerful absorption. Much thicker absorbing wedges were required, and these gave trouble, even when compensated, as a result of dispersion. It was therefore decided to limit the present work chiefly to a study of the aniline dyes, which are used to a much greater extent than the metallic salts, in the preparation of absorbing screens. The absorption spectra of a number of metallic salts, however, have been photographed, as it is believed that many of them will be useful in the preparation of ray filters; some of them are far more transparent in the ultra-violet than the aniline dyes. Even such substances as the salts of erbium, neodymium, and praseodymium are useful in special cases where it is desired to suppress one or more isolated spectral lines. For example, a solution of neodymium has a very narrow and intense band coincident with the D lines, and has therefore the property of cutting out the sodium radia tion from a given source, transmitting at the same time nearly the whole of the remainder of the spectrum. The same salt can be used to advantage when working with the new cadmium and zinc arc lamps in quartz tubes. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... 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.
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