Excerpt from The Society of Engineers, Incorporated: Transactions for 1915 It will be seen from the above that the distance of penetration Of white light varied from 4 to 15 miles, the maximum being attained only in the exceptional conditions where the atmosphere was completely transparent. It is also interesting to note that the atmosphere is more transparent in the Mediterranean than in the Atlantic coast. An idea may also be formed of the relative power Of the coloured lights used. 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.