Mr. Edward Arnold's Autumn Announcements 15 



THE THEORY OF STRUCTURES. 



By R. J. WOODS, M.lNST.C.E., 



FELLOW AND FORMERLY ASSISTANT PROFESSOR OF ENGINEERING, ROYAL INDIAN ENGINEERING 

 COLLEGF., COOPER'S HILL. 



With 157 Illustrations. Demy 8vo., cloth. ios. 6d. net. 



The author deals with the design of masonry and steel structures, 

 as based upon the determination of the working stresses in them. 

 Various types of girders, with parallel chords, parabolic, and with 

 curved chords not parabolic, plate girders, arched ribs, and suspen- 

 sion bridges are in turn considered. 



Other chapters are concerned with the strength of columns and 

 design of struts, riveted joints, and earth pressure, and a final 

 chapter is devoted to reinforced concrete construction. 



The subjects are treated from a practical point of view, and a large 

 number of examples from everyday practice are worked out. 

 Although self-contained and independent, the volume forms a more 

 advanced continuation of the same author's previous book, 'The 

 Strength and Elasticity of Structural Members.' 



THE GEOLOGY OF ORE-DEPOSITS. 



By H. H. THOMAS and D. A. MACALISTER, 



OF THE GEOLOGICAL SURVEY OF GREAT BRITAIN. 



Illustrated. Crown 8vo., cloth. 75, 6d. net. 



This book forms the second volume in the Geological Series now 

 being issued under the general editorship of Dr. J. E. Marr, F.R.S., in 

 in which especial attention is paid to the economic aspect of Geology. 



The authors here present as concisely as possible an account of the 

 various processes by which in nature local concentrations of metal- 

 liferous material have been brought about in such amounts and 

 under such conditions that the ores become commercially valuable. 

 Segregation from igneous magmas, pneumatolysis, hydatogenesis, 

 and metasomasis are first described ; next, precipitation from solution, 

 and sedimentary deposits ; and lastly, secondary changes in lodes. 

 The subject is one of great importance, not only to the student of 

 geology, but also to the practical mining expert, and the authors 

 have considered typical deposits of all the principal metals with 

 examples from various parts of the world. 



A TEXT-BOOK OF 

 ELECTRICAL ENGINEERING. 



By DR. ADOLF THOMALEN. 

 Translated by G. W. O. HOWE, M.Sc., 



SENIOR WHITWORTH SCHOLAR, LECTURER IN ELECTRICAL ENGINEERING AT THE 

 CITY AND GUILDS COLLEGE. 



Second edition, revised and enlarged. With 454 Illustrations. Royal 8vo., 



cloth, 155. net. 



The call for a second edition of Mr. Howe's translation of Dr. 

 Thomalen's ' Kurze Lehrbuch der Elektrotechnik ' shows that it has 

 successfully met the want for a good text-book to bridge the gap 



