ON THE MECHANICAL PROPERTIES OF STEEL. 



193 



TRANSVERSE STRAIN. 



Exp. XXYIII.— Bar of Steel from Messrs. Bessemer & Co., Sheffield. Di- 

 mension of bar -99 inch square. Length between supports 4 feet 

 6 inches. Mark on bar, " B S 1." 



Results of Exp. XXVIII, 



Here the weight {iv) at the limit of elasticity is 1110 lbs,, and the cor- 

 responding deflection (I) is 1-530. 



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

 and section (D,) = -0021814. 



Bj formula (7).— The mean value of the modulus of elasticity CE) 

 = 29,652,000. ^ ^ ' 



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

 pressure = 29,104,000. 



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

 = 70-762. \ J i. i 



By foi-mula (9).— Work of deflection («) for unity of section = 72-199. 

 By formula (12).— Yalue of C, the unit of working strength = 6-882 tons. 



