Action of Sunlight on Glass PDF ePub eBook

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Action of Sunlight on Glass free pdf Excerpt from Action of Sunlight on Glass "This fact coming to his knowledge led him to try an experiment with several specimens of plate, crown, and sheet glass, during the month of July last- which proved that a month's exposure to a hot sun would change the best white French plate and all white sheet glass, such as is used for photographs and engravings, to a color containing more or less of a yellow hue. The dark green and dark blue or bluish green did not experience any change- but any hue which approached a white, whether bluish, greenish, or yellowish white, turned to a yellowish color. A second series of experiments, commenced in July, and continued three months, on some thirty specimens from France, England, Belgium, Germany, and the united States, only confirmed the results of the first- and a daily examination at first, and afterward from week to week, and month to month, revealed the interesting fact, that, even after a single day's exposure to a July sun, the change of color will, in some instances of the lightest hues, commence. "So remarkable was the change in a week, affecting nearly all the light-colored glasses, that he commenced a third experiment on the 6th of August which should speak for itself. He then exhibited to the Society ten pieces of French white plate-glass, four by two inches in size (all of which were cut from the same sheet), one of which showed the original colorless glass, and the others exhibiting the change of hue towards yellow, after exposure respectively of one, two, and four days- one, two, and three weeks- one, two, and three months. "The changes in the first four days were slight- but the last specimens were so yellow as to exhibit a contrast very marked, and exoited the interest of all the members present. That the color permeates the body of the glass, and is not confined to the surface, or produced by reflection therefrom, has been conclusively proved by grinding off about one-sixteenth of an inch from both surfaces and the four edges of a duplicate exposed specimen, which, after repolishing, still exhibited the same yellow color. . "The glasses exposed were all what are called colorless window-glasses, although they varied in tinge and hue from the whitest French plate to the darkest green English sheet-glass. "An experiment for four months, from July to November, on really colored glasses, red, green, yellow, blue, and purple, showed no change except in the purple, which became slightly darker. 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.

About Thomas Gaffield

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Details Book

Author : Thomas Gaffield
Publisher : Forgotten Books
Data Published : 27 September 2015
ISBN : 1331993121
EAN : 9781331993124
Format Book : PDF, Epub, DOCx, TXT
Number of Pages : 30 pages
Age + : 15 years
Language : English
Rating :

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  • Action of Sunlight on Glass free pdfAction of Sunlight on Glass

    Downloads Books. Excerpt from Action of Sunlight on Glass "This fact coming to his knowledge led him to try an experiment with several specimens of plate, crown, and sheet glass, during the month of J