J). VAN" JSrOSTJiAJSTD. 



Francis on Oast-Iron Pillars. 



8vo. Cloth. $3.00. 



ON THE STEENGTH OF CAST-IEON PILLAES, with Tables 

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

 PaAjfcis, Civil Engineer. 



Merrill's Iron Truss Bridges. 



Second Edition. 



4to. Cloth. $5.00. 



lEON TRUSS BRIDGES 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. Meeeill, U.S.A., 

 Major Corps of Engineers. Mne lithographed plates of illustra- 

 tions. 



" The work before ua is an attempt to give a basis for sound reform in this 

 feature of railroad engineering, by throwing ' additional light upon the 

 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 uf 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 occaaion hereafter to make investigations involving these conditions. As 

 a whole, the work has been weU done." — BaiUroad Oaaette, Chicago. 



Humber's Strains in G-irders. 



18mo. Cloth. $2.50. 



A HANDY BOOK FOE THE CALCULATION OF STEAINS 

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

 sisting of Formulae and Corresponding Diagrams, with numerous 

 details for practical applicatiou. By Williau Hvxiieii, Fully 

 illuatrated. 



