Excerpt from American Machinists' Handbook and Dictionary of Shop Terms: A Reference Book of Machine Shop and Drawing-Room Data, Methods and Definitions Ever since the first printing of this book, the authors have been studying ways and means of making it better, and the addition of one hundred and sixty pages by no means gives an adequate idea of the extent to which it has been revised. 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.