Excerpt from The Designing of Draw-Spans The following pages aim to give a clear and simple explanation of the methods used in the determination of the stresses, sections required, and of the deflections produced by the various conditions of loading assumed. The machinery necessary for operating the draw is also considered, and the designing of wedging machinery for raising the ends, latching devices for preserving perfect alignment when the draw is closed, methods of raising the rails for clearance when the draw is opened, and the designing of gears, shafting, and bearings are considered in detail. Each point as taken up is illustrated by examples, as fully as necessary to make the applications clear. The aim has been to use the simplest methods, rules, and tables that will give the desired results. Where formulae derived from the higher mathematics have been used, full and complete explanations of how they are used and applied are given. 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 techlogy 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.