Excerpt from Catechism of Central Station Gas Engineering in the United States The matter in this volume has been compiled from the questions and answers sent out to the members of the Practical Class, which has been taught by correspondence since 1895, at first by the Committee on Education of the American Gas Light Association, and since 1899 by the Trustees Gas Educational Fund. These questions and answers have been printed in the Proceedings of the American Gas Light Association and the American Gas Institute, but many requests have been made that they be published in one volume, arranged according to subjects, and this book has been prepared to meet this demand. Among the questions there have been necessarily many covering the same subject from slightly different standpoints. In gathering them together it has been thought best, in some cases, to include more than one question and answer on a subject, even though this involved repetition. Answers or portions of answers which are enclosed in quotation marks, without being credited to any authority, have been taken from the answers sent in by members of the Class. Those which are neither quoted nor credited, have been prepared during the regular course of the class work by the Trustees. It is hoped that, although primarily intended to give the younger workers in the gas business a better knowledge of the principles involved, and the apparatus employed in this business and to aid them to do better work, these questions and answers will also be of service to the older workers in recalling to them the reasons for methods of operation which have come to be accepted as a matter of course. 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.