6 SCIENTIFIC BOOKS PUBLISEEE ET 
Stoney on Strains. 
New and Revised Edition, with numerous illustrations. 
Royal 8vo, 664 pp. Cloth. $12.50. 
THE THEORY OE STRAINS IN GIRDERS and Similar Struc- 
tures, with Observations on the Application of Theory to Practice, 
and Tables of Strength and other Properties of Materials. By 
Bindon B. Stoney, B. A. 
Roebling’s Bridges. 
Imperial folio. Cloth. $25.00. 
LONG AND SHORT SPAN RAILWAY BRIDGES. By John 
A. Roeblino, 0. E. Illustrated with large copperplate engrav- 
ings of plane and views. 
List of Plates 
1. Parabolic Truss Railway Bridge. 2, 3, 4, 5, 6. Details of Parabolic 
Truss, with eentre span 500 feet in the clear. 7. Plan and View of a Bridge 
over the Mississippi River, at St. Louis, for railway and common travel. 8, 9, 
10, 11, 12. Details and View of St. Louis Bridge. 13. Railroad Bridge over 
the Ohio. 
Diedridis’ Theory of Strains. 
8vo. Cloth. $5.00. 
A Compendium for the Oalculation and Construction of Bridges, 
Roofs, and Oranes, with the Application of Trigononaetrical 
Notes. Containing the most comprehensive information in re- 
gard to the Resulting Strains for a permanent Load, as also for 
a combined (Permanent and Rolling) Load. In two sections 
adapted to the requirements of the present time. By Jojin Died- 
hichs. Illustrated by numerous plates and diagrams. 
“ The want of a compact, universal and populär treatise on the Construc 
tion of Roofs and Bridges—especially one treating of the influence of a varia 
ble load—and the unsatisfactory essays of different authors on the subject, 
induced me to prepare fhis work.”