The Interferometry of Reversed and Non-Reversed Spectra, Vol. 2 (Classic Reprint) by Carl Barus
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Author: Carl Barus
Number of Pages: 154 pages
Published Date: 27 Sep 2015
Publisher: Forgotten Books
Publication Country: United States
Language: English
ISBN: 9781332053773
File size: 43 Mb
Download Link: The Interferometry of Reversed and Non-Reversed Spectra, Vol. 2 (Classic Reprint)
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Excerpt from The Interferometry of Reversed and Non-Reversed Spectra, Vol. 2
In the present volume I have pursued the work on the interferences of reversed and non-reversed spectra, begun in my last report (Carnegie Inst. Wash. Pub. No. 249, 1916), in a variety of promising directions, such as the original investigation suggested. It will be remembered that the reversal (180 ) here contemplated takes place on a transverse line of the spectrum (i.e., a line parallel to the Fraunhofer lines), which thereby becomes a line of symmetry for the phenomena. The apparatus has been extensively modified, so as to admit of measurements relating to individual fringes. The object of such quantitative work, however, is to furnish a guide for the development of the experiments and to corroborate equations, not to collate standard data. These could hardly be satisfactorily obtained, moreover, unless the work were done with optical plates and mirrors, whereas the work in this volume and the preceding has been done with ordinary window-plate and usually with film gratings.
A large part of Chapter I is devoted to the treatment of prismatic methods, developed with the additional purpose of securing a greater intensity of light. A very curious intermediate case between the interferences of reversed and non-reversed spectra is the pronounced interference of spectra from the same source, but of different lengths (dispersion) between red and violet. The phenomena of crossed rays find a parallel occurrence in the present paper, in the behavior of duplicated fringes, when similar gratings or prisms disperse and subsequently recombine a beam of white light. A type of fringes is detected which depends merely on the grating space and is independent of wave-length. An interesting question as to the limits of micrometer displacement within which fringes of any kind are discernible (observations which were at first supposed to be due to the degree of uniformity of interfering wave-trains) is eventually shown to be a necessary result of dispersion. Finally, the direct interference of divergent rays obtained from polarizing media is exhibited.
In Chapter II the interferences of inverted spectra, a subject merely touched in the preceding volume, are given greater prominence. In this case one of the two spectra from the same source is inverted (180 ) relatively to the other on a longitudinal axis (i. e., an axis normal to the Fraunhofer lines), which thus becomes a line of symmetry. In the development of the subject, spectra half reversed and spectra both reversed and inverted are treated successfully. In the latter case the conditions of interference arc fulfilled at but a single point in the whole area of the spectrum field; and yet the phenomenon is pronounced and not very difficult to realize. The limits of micrometer displacement within which interferences may be obtained are again determined. At the end of the chapter it was thought useful to collate available equations in the treatment of phenomena of the present kind.
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