COMPRISING THE PRACTICE AND THEORY OF THE SEVERAL METHODS BY WILLIAM HENRY GREENWOOD, F.C.S., Assoc. M.I.C.E., M.I.M.F., ASSOCIATE OF THE ROYAL SCHOOL OF MINES. WITH 97 DIAGRAMS FROM ORIGINAL WORKING DRAWINGS. SECOND EDITION. CASSELL & COMPANY, LIMITED: LONDON, PARIS & NEW YORK. [ALL RIGHTS RESERVED.] 1884. PREFACE. 1884 THE aim of the present work on Steel and Iron has been to produce, within moderate limits, a comprehensive Manual of practical information and of the scientific principles upon which the practice rests. The author hopes in this manner to render the book of service to the general student of the branch of Technical Science of which it treats, and also to offer to the intelligent workman a succinct statement of the scientific principles upon which depends the success of the several processes conducted or superintended by him, and upon which the construction of his plant or machinery is based. The book, therefore, is not intended to supersede the experience and practical knowledge that can be gained only in the Works, but the author hopes it will be found a useful adjunct to, and contribute to a clearer understanding of, these things. The information has, as far as possible, been brought up to date, and for this purpose numerous articles in English and Foreign Scientific Journals and Proceedings of Societies have been consulted. In elucidating the text, the author has preferred to use practical drawings rather than mere pictures, and he thinks that an elementary acquaintance with mechanical drawings will enable the reader to fully understand 290 |