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Excerpt from Data on Ultra-Violet Solar Radiation and the Solarization of Window Materials Some years ago special window glasses were put on the market for transmitting the short wave length ultra-violet rays of the solar spectrum, shut out by common window glass. Early in the spring of 1927, reports came to this bureau that these glasses appeared to be losing their transparency as the result of solarization, which is the designation of the photochemical reaction most of these glasses undergo on exposure to sunlight. 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.