204 



REPORT 1867. 



TBASSTEBSE SXEAIN. 



Exr. XXXIX. — Bar of Steel from Jlessrs. Tnrton and Sons, Sheffield. 

 Dimension of bar -986 inch square. Length between supports 4 feet 

 6 inches. Mark on bar, " D." 



Besults of Exp. XXXIX. 



Here the weight (w) at the limit of elasticity is 1010 lbs., and the cor- 

 responding deflection (S) is 1-408. 



Ey formula (6). — The mean value of the deflection for unity of pressure 

 and section (D^) = •001287. 



By formula (7).- — The mean value of the modulus of elasticity (E) 

 = 30,887,000. 



By formula (2). — The modulus of elasticity (E) corresponding to 112 lbs. 

 pressure = 32,462,000. 



By formula (8).— Work of deflection (U) up to the limit of elasticity 

 = 59-253. 



By formida (9).— Work of deflection (m) for unity of section = 60-949. 



By formula (12). — Yalue of C, the unit of working strength = 6-337 tons. 



