D. VAN NOSTRAND. 



Francis on Cast-iron Pillars. 



8vo. Cloth. $2.00. 



ON THE STRENGTH OF CAST-IEON PILLARS, with Tables 

 for the use of Engineers, Architects, and Builders. By J.OIES B. 

 FRANCIS, Civil Engineer. 



Merrill s Iron Truss Bridges. 



Second Edition. 



4to. Cloth. $5.00. 



IRON TEUSS BRIDGES FOR RAILROADS. The Method of 

 Calculating Strains in Trusses, with a careful comparison of tho 

 most prominent Trusses, in reference to economy in combination, 

 etc., etc. By Brevet Colonel WILLIAM E. MERRILL, U.S.A., 

 Major Corps of Engineers. Nino lithographed plates of illustra 

 tions. 



&quot; The work before us is an attempt to give a basis for sound reform in this 

 ^feature of railroad engineering, by throwing additional light upon tho 

 method of calcul iting the maxima strains that can come upon any part of a 

 bridge truss, and upon the manner of proportioning each part, so that it shall 

 be as strong relatively to its own strains as any other part, and so that tho 

 entire bridge may be strong enough to sustain several times as great strains 

 as the greatest that can come upon it in actual use. &quot; Scientific American. 



&quot; The author has presented his views in a clear and intelligent manner, and 

 the ingenuity displayed in coloring the figures so as to present certain facts 

 to the eye forms no inappreciable part of the merits of the, work. The reduc 

 tion of the formulae for obtaining the strength, volume, and weight of a cast- 

 iron pillar under a strain of compression, will be very acceptable to those who 

 have occasion hereafter to make investigations involving these conditions. As 

 a whole, the work has been well done.&quot; Railroad Gazette, Chicago. 



Humber s Strains in Girders. 



18mo. Cloth. $2.50. 



A HANDY BOOK FOR THE CALCULATION OF STRAINS 



IN GIRDERS and Similar Structures, and their Strength, con 

 sisting of ForniulcG and Corresponding Diagrams, with numerous 

 details for practical application. By WILLIAM HuiiBER, Fully 

 illustrated. 



