EXPERIMENTS REGARDING EFFICIENCY OF SPECTROGRAPHS (CLASSIC REPRINT)
Physics laboratory experiments (edición en inglés)
- ISBN: 9781396541032
- Encuadernación: Sin formato definido
Excerpt from Experiments Regarding Efficiency of SpectrographsIt is a well known fact and has been repeatedly stated that. The modern star spectrograph is exceedingly wasteful of light. If we. Leave out of consideration for the present the light occulted by the slit jaws, careful computation of the losses by absorption and reflection in the optical train shows that at H, about 25 per cent. Of the light is transmitted by a one prism and about 8 per cent. By a three-prism spectrograph. The loss at the slit will depend upon its width. The focal ler gth of the telescope objective and the. Conditions of seeing and will vary from 50 to 90 per cent. If we add losses in the. Objective of the telescope. We get from 2 to 8 per cent. Of the incident star light in none-prism and from to 3 per cent. In a three-prism spectrograph effective in producing the spectrum.This was recognized at the meeting of the Committee of the Astro nemical and Astrophysical Society of America on co-operation in Radial Velocity Determinations at Mt. Wilson in 1910, and methods of increasing the efficiency of the spectrograph were discussed and various suggestions offered. As the writers part of the work, and with the consent of the Director, Dr. King. Experiments on the use of the plane grating as the dispersion piece of a stellar spectrograph were undertaken, and the results are recounted in the first. Part of this publication.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 succe
Experiments with alternate currents of high potential and high frequency
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