D. VAN NOSTRAND. 



Whilden's Strength of Materials, 



12mo. Cloth. $2.00. 



ON THE STEENGTH OF MATEEIALS used in Engineering 

 Congtruction. By J. K. WHILDEN. 



Campin on Iron Roofs. 



Large 8vo. Cloth. $2.00. 



ON THE CONSTEUCTION OF IEON EOOFS. A Theoretical 

 and Practical Treatise. By FHANCIS CAMPIN. With wood-cuts 

 and plates of Eoofs lately executed. 



" The mathematical formulas are of an elementary kind, and the process 

 admits of an easy extension so as to embrace the prominent varieties of iron 

 truss bridges. The treatise, though of a practical scientific character, may be 

 easily mastered by any one familiar with elementary mechanics aad plane 

 trigonometry." 



Holley's Railway Practice. 



1 vol. folio. Cloth. $12.00. 



AMEEICAN AND EUEOPEAN EAILWAY PEACTICE, in 



the Economical Generation of Steam, including the materials 

 and construction of Coal-burning Boilers, Combustion, the Varia- 

 ble Blast, Vaporization, Circulation, Super-heating, Supplying 

 and Heating Feed- water, &c., and the adaptation of Wood and 

 Coke-burning Engines to Coal-burning ; and in Permanent Way, 

 including Eoad-bed, Sleepers, Eails, Joint Fastenings, Street 

 Eailways, &c., &c. By ALEXANDER L. HOLLEY, B. P. With 77 

 lithographed plates. 



" This is an elaborate treatise by one of our ablest civil engineers, on the con- 

 struction and use of locomotives, with a few chapters on the building of Rail- 

 roads. * * * All these subjects are treated by the author, who is a 

 first-class railroad engineer, in both an intelligent and intelligible manner. The 

 facts and ideas are well arranged, and presented in a clear and simple style, 

 accompanied by beautiful engravings, and we presume the work will be regard- 

 ed as indispensable by all who are interested in a knowledge of the construc- 

 tion of railroads and rolling stock, or the working of locomotives." Scientific 

 American. 



