Monthly Notices of the Royal Astronomical Society, Vol. 29 PDF Download

Author: Royal Astronomical Society
Publisher: Forgotten Books
ISBN: 9781334151392
Category : Science
Languages : en
Pages : 424

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Book Description
Excerpt from Monthly Notices of the Royal Astronomical Society, Vol. 29: Containing Papers, Abstracts of Papers, and Reports of the Proceedings of the Society, From November, 1868, to June, 1869 My object in this Note is to describe one of the other contri vances mentioned in the Report. The apparatus consisted of screens of coloured glasses and other absorptive media, by which I was able to isolate portions of the spectrum. It appeared highly probable that if the parts of the spectrum which then alone remained were identical with those in which the bright lines of the ames occur, these objects would become visible. For this inquiry I obtained a great variety of coloured glasses and other absorptive media. I first examined them with a prism to learn the absorptive power which they exercised on different parts of the spectrum. I then combined them in various ways. These glasses were sometimes employed before the eye, but more frequently by projecting the image of the Sun's edge upon a screen, after the light had been sifted by the coloured media. In making these experiments means were taken that the whole of the Sun's image should be got rid of, in order that the eye, kept in comparative darkness, might be more sensitive to the greatly feebler illumination of the objects sought for. As I had no know ledge of the position in the spectrum of the bright lines, it would have been by accident only if I had succeeded in obtaining a view of the ames. Now that the positions of these lines are known, this method appears to be very promising. Perhaps the light about the red line at C will be most easily isolated. I have a deep ruby glass which cuts off all the spectrum except the extreme red. I have since the observations only been able to make one attempt, when the state of the atmosphere was unfavourable. It is obvious that by this method the form and appearance of these ames could be observed, and the objects measured with accuracy. Oh a possible Method of viewing the Red Flames without an Eclipse. 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."