Excerpt from Useful Rules and Tables: Relating to Mensuration, Engineering, Structures, and Machines The Fourth Part relates to Distributed Forces and Mechanical Centres. It includes tables of heaviness and specific gravity, and of expansion by heat and rules for finding centres of gravity, moments of weight and of inertia, centres of pressure, centres of percussion, and centres of buoyancy. The Fifth Part relates to the Balance and Stability of Structures, including frames, chains, and arched ribs, retaining walls, piers and abutments, arches of masonry, and foundations of different kinds. 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.