Steam:
Its Generation and Use

preface. (To First Edition, 1879.) While making known the character and quality of our manufactures, we have endeavored at the same time to present to our friends and customers a variety of useful information, not readily accessible to them in other ways. The facts and figures herein given are derived largely from practical experience, and can be depended upon as correct. \ ery few of them were ever published before, while*those derived from the researches of others have been simplified and adapted to the wants of manufacturers. It is with the intention, at some future time, to collect them with others into a more permanent form, that they have been copyrighted. (To Eleventh Edition, 1883.) In preparing a new edition of “Steam,” we have revised the whole, and added much new and valuable matter, which we trust our customers will find useful and interesting. (To Thirteenth Edition, 18858) Having again revised “Steam,” and enlarged it by the addition of new and useful inform- ation, not published heretofore, we shall feel repaid for the labor, if it shall prove of value to our customers. (To Twentieth Edition, 1889.) Over 75,000 copies of “ Steam ” have been issued in the long form, in which it was formerly published. But many having expressed a desire to have it in a shape suitable for a library, and it becoming necessary to make new plates, the work has been again carefully revised, much new matter added, and the form changed to large octavo. It is hoped that in its new form, and with its additional matter, it will prove even more useful to the public.