Présentation de l'éditeur
Preface toE leventh Edition. SINCE Helios was first published, eighteen years ago, many changes in engineering practice have come about, and many of the previously accepted constants which were based on experimental data, have been changed as the result of more refined methods of determination. In order to bring everything up to date the entire text has been rewritten and a determined effort has been made to have all data authentic and accurate. We feel no hesitancy in commending the book as worthy of confidence and for ready reference, to every one who may find use for the material which it contains. As Helios falls into the hands of all classes of those interested in steam engineering, its scope must be broad, and much of the text will therefore appear elementary to some, but there will doubtless be something of interest to all. The main value of the book to us lies in its value to others and while it is issued primarily as a piece of advertising literature most of the matter relating to the Heine Boiler has been grouped in the back pages. St. Louis, January 1, 1912.
(Typographical errors above are due to OCR software and don't occur in the book.)
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