Excerpt from Safety-Valves: Their History, Antecedents, Invention and Calculation; Including the Most Recent Examples of Weighted and Spring Loaded Valves; Also, Showing the Effect of Atmospheric Pressure on Safety-Valve Disks The importance of having the general principles of Safety. Valves understood by those who are charged with the care of steam boilers, cannot well be over estimated. 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.