D, VAN NOSTRAND. 3 



Francis on Cast-Iron Pillars. 



8vo. Cloth. $2.00. 



ON THE STEENGTH OF CAST-IRON PILLAES, with. Tables 

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

 FRANCIS, Civil Engineer. 



Merrill's Iron Truss Bridges. 



Second Edition. 



4to. Cloth. $5.00. 



IEON TEUSS BEIDGES FOE EAILEOADS. The Method of 

 Calculating Strains in Trusses, with a careful comparison of the 

 most prominent Trusses, in reference to economy in combination, 

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

 Major Corps of Engineers. Nine lithographed plates of illustra- 

 tions. 



" 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 calculating 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 the 

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

 as the greatest that can come upon it in actual use.' " Scientific American. 



" 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." Railroad Gazette, Chicago. 



Humber's Strains in Girders. 



18mo. Cloth. $2.50. 



A HANDY BOOK FOE THE CALCULATION OF STEAINS 

 IN GrIEDEES and Similar Structures, and their Strength, con- 

 sisting of Formula) and Corresponding Diagrams, with numerous 

 details for practical application. By WILLIAH HUMBER, Fully 

 illustrated. 



