Excerpt from Elbow Patterns for All Forms of Pipe: A Treatise Upon the Elbow Pattern Explaining the Most Simple and Accurate Methods for Obtaining the Patterns for Elbows in All Forms of Pipe Made From Sheet Metal, With Useful Mathematical Rules and Tables Fig. I. - Illustrating a four-pieced square elbow, which when reduced to its simplest form contains three elbows at an angle of 30 degrees. 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.