Excerpt from On the Application of Cast and Wrought Iron to Building Purposes In the section on Cast-iron Beams there was little to add to what was contained in the first edition, beyond some tables of the results of experimental researches into the strength and constitution of iron, and its improvement by certain pro cesses of manufacture. In the course of my experience I have seen no reason to change the opinions I had previously expressed on the uncertain character of trussed girders, and I still advise the exercise of great caution in their employ ment, from the conviction that they are equally unsound in principle and dangerous in practice. In the section on trellis beams some additional examples have been added. 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.