Excerpt from Valves and Valve Gears, Vol. 1: Volume I Steam Engines and Steam Turbines; Volume II Gasoline, Gas and Oil Engines Much of the material in this work has been arranged after ex tended visits to drafting rooms in which the work in valve gears was being carried on in a practical way, and it is believed that the methods here presented will be found to agree fairly well with general practice. In writing up the descriptions Of the practical forms of valves and valve gears the author has received numerous courtesies from manufacturers which are hereby acknowledged. It has been the rule to have the manufacturer Of the valve or gear or engine described to pass finally on the accuracy Of the description and Of the illustrations that appear in this work. Every illustration has been newly prepared for this edition. In order to avoid the use of subscripts in numbering the illustrations and paragraphs as the work Of preparation proceeded, and as changes and additions were made, the author laid out the work originally by leaving ten numbers free at the end Of each section. It will be found that these numbers have been all used at the end of some of the sections and that none have been used at the end Of other sections. The page numbers, however, are in consecutive order throughout the book. 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.