Condensation Of Vapor As Induced By Nuclei And Ions

Author : Carl Barus
Publisher : Forgotten Books
ISBN 13 : 9781332052639
Total Pages : 150 pages
Book Rating : 4.0/5 (526 download)

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Download or read book Condensation of Vapor as Induced by Nuclei and Ions written by Carl Barus and published by Forgotten Books. This book was released on 2015-07-28 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Condensation of Vapor as Induced by Nuclei and Ions: Third Report In the following report I have given an account of experiments made with a plug-cock fog chamber during the last year and a half. The first chapter summarizes the equations frequently needed and adds other important suggestions relating to the efficiency of the apparatus used for condensation of water vapor suspended in air. I have adduced, in Chapter II, the results of a long series of experiments begun May 9, 1905, to determine whether the colloidal or vapor nucleations of dust-free air show any interpretable variations in the initial regions (ions), which would correspond to variations of a natural radiation entering the chamber from without. The fog-chamber method seems to be too complicated to give trustworthy indications of such changes of ionization as have been since discovered with the aid of the electrical method by Wood and Campbell. An interesting result, however, came out of the experiments in question, as a whole, showing that the vapor nucleation is variable with temperature in the region examined to the extent of about 2 percent per degree. The fog chamber used in the present research having undergone varied modifications since the coronas were last standardized(1904), it seemed necessary to repeat the work for the present report. This was particularly necessary because the subsequent investigations were to depend essentially on the values of the nucleation observed. These comparisons are shown in Chapters III and IV. In the former the diffractions are obtained from a single source of light and the angular diameter of the coronas is measured by a goniometer; in the latter the fiducial annuli of two coronas due to identical sources of light are put in contact and the distance apart of the lamps is measured under known conditions. This contact method has many advantages and above all admits of the use of both eyes. In both cases, moreover, the nucleation of dust-free air, in the presence as well as in the absence of penetrating artificial radiation, is redetermined. All results agree among themselves and with the older work, as closely as may be expected in work of the present kind, below the middle green-blue-purple corona (usually corresponding to 10 5 nuclei); but above this there is much divergence, which will probably not be overcome until some means for keeping the air rigorously homogeneous in nucleation throughout a given series of experiments has been devised. Chapter V contains some remarkable results on the properties of nuclei obtained from the evaporation of fog particles. 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.