Excerpt from The Civil Engineer and Architect's Journal, Scientific and Railway Gazette, 1844, Vol. 7 I have lately employed, in some large ships destined for transatlantic voyages, a species of brine gauge, or index of saturation, which is found to possess every advantage, and which I therefore desire to communicate to the public through this society. The drawings sent are such as may enable any engineer to construct them for himself. The details of the arrangement of the apparatus were made under the direction of M r James Laurie, formerly one of my assistants; and he also has obliged me by writing out the annexed description of the Operation of using the index. 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.