Book Description

Excerpt from Johnson's Materials of Construction: Rewritten There have also been some changes in the scope of the new work. The space devoted to the principles of mechanics has been materially reduced by more concise treatment. In general, discussion of the proper ties of composite members has been omitted. The writers feel justified in this omission since these subjects are now well treated in many text books on mechanics, structural design, and reinforced concrete. In the portion devoted to timber, space has been conserved by the omission of the descriptions of trees and by a complete revision and rearrangement of material, thus avoiding the duplications present in the earlier book. The methods of microscopic analysis and magnetic testing of metals have been omitted since it is felt that an adequate treatment of these very important special methods of investigation can not be given in a treatise of this char acter. On the other hand the new work treats more fully than the former concerning structural clay products, limes and plasters, Portland cement, making and testing of concrete, the methods of manufacture of the metals and the parts made of them, the structure and constitution of metals and alloys, the corrosion and protection of metals, and the decay and preserva tion of timber. Great care has been taken to illustrate adequately the revised work with material from the best sources. Old figures have been redrawn and, wherever possible, reduced in size. The large use of diagrams and charts in presenting facts and laws, and the omission of tables wherever possible has featured the present volume as it did the previous book. Dean Johnson well said. 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.