Excerpt from Audels Engineers and Mechanics Guide 6: A Progressive Illustrated Series With Questions-Answers Calculations Covering Modern Engineering Practice; Specially Prepared for All Engineers, All Mechanics and All Electricians In planning this helpful series of Educators, it has been the aim of the author and publishers to present step by step a logical plan of study in General Engineering Practice, taking the middle ground in making the information readily available and showing by text, illustration, question and answer, and calcula tion, the theories, fundamentals and modern applications, includ ing construction in an interesting and easily understandable form. Where the question and answer form is used, the plan has been to give short, simple and direct answers, limited to one paragraph, thus simplifying the more complex matter. 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.