FOR ENGINEERS AND OTHERS. In Crown 8vo, Cloth, with Diagrams. Thirteenth Edition. 12s. 6d. 1. APPLIED MECHANICS (A MANUAL OF). Twelfth Edition. 12s. 6d. 2. CIVIL ENGINEERING (A MANUAL OF). Seventeenth Edition. 168. 8. THE STEAM ENGINE AND OTHER PRIME MOVERS. 4. MACHINERY AND MILL-WORK. Sixth Edition. 12s. 6d. 5. USEFUL RULES AND TABLES FOR ENGINEERS. With Electrical Appendix. By A. JAMIESON, C.E., F.R.S. E. Seventh Edition. 10s. 6d. 6. A MECHANICAL TEXT-BOOK. By Professor RANKINE and E. F. BAMBER, O.E Fourth Edition. 9s. PROFESSOR RANKINE'S MISCELLANEOUS SCIENTIFIO PAPERS. With Memoir by Professor TAIT, M.A., and Fine Portrait on Steel. Royal 8vo, handsome cloth. 81s. 6d. Medium 8vo, with 48 Lithographic Plates and Numerous Woodcuts, 258. HYDRAULIC POWER AND HYDRAULIC MACHINERY. For the Use of Practical Engineers and Students. BY HENRY ROBINSON, M. INST. C. E., F. G. S., "A Book of great Professional usefulness."-Iron. Medium 8vo, with Numerous Lithographic Plates and Woodcuts, 30s. BRIDGE-CONSTRUCTION (A Practical Treatise on). A Text-book on the Design and Construction of Bridges in Iron and Steel. BY T. CLAXTON FIDLER, M. INST. C.E. "Should prove not only an INDISPENSABLE Hand-book for the Practical Engineer, but also a stimulating Treatise to the Student of Mathematical Mechanics and Elasticity."-Nature. SECOND EDITION. Pocket-Size, Leather; also, for Office use, in Crown 8vo, Cloth. 12s. BOILERS: THEIR CONSTRUCTION AND STRENGTH. A Handbook of Rules, Formulæ, Tables, &c., relative to Material, Scantlings and Pressures, Safety Valves, &c. For the use of Engineers, Inspectors, Surveyors, Draughtsmen, Boilermakers, and Steam Users. By T. W. TRAILL, F.E.R.N., M. INST. C.E., Engineer-Surveyor-in-Chief to the Board of Trade. "We can strongly recommend Mr. Traill's Book as being the most complete and eminently practical work on the subject."—Marine Engineer. With Illustrations. 9s. FUEL AND WATER. BY PROF. FR. SCHWACKHÖFER AND WALTER R. BROWNE, M. A., C. E. "The PRACTICAL UTILITY of the work is beyond question."—Mining Journal. LONDON: CHARLES GRIFFIN & CO., EXETER STREET, STRAND. THE 39526 DESIGN OF STRUCTURES: A Practical Treatise ON THE BUILDING OF BRIDGES, ROOFS, &c. Samuel, BY ANGLIN, C. E., MASTER OF ENGineering, royAL UNIVERSITY of Ireland, With numerous Diagrams, Examples, and Tables. LONDON: CHARLES GRIFFIN & COMPANY, EXETER STREET, STRAND. 1891. [All Rights Reserved.] PREFACE. IN undertaking this work, my principal object has been to supply the want, long and universally felt among Students of Engineering and Architecture, of a concise Text-book on Structures, requiring on the part of the reader a knowledge of elementary mathematics only. In order to obtain complete information on the subject it has been necessary, hitherto, to consult a large number of books, and these, moreover, have been generally too advanced for the average student. The present work is an attempt to remove, or at least to minimise, these disadvantages. Throughout, my aim has been to treat the different branches of the subject from a practical, as well as from a theoretical, stand-point; and with this object I have introduced, and carefully worked out, a large number of Practical Examples such as occur in the every-day experience of the Engineer. Several of these Examples are solved both analytically and graphically, one method being used as a check upon the other. The subject of Graphic Statics has only of recent years been generally applied in this country to determine the Stresses on Framed Structures; and in too many cases this is done without a knowledge of the principles upon which the science is founded. I have tried to explain it from first |