ON THE MECHANICAL PROPERTIES OF STEEL. 



207 



TEANSTEESE STRAIN, 



Exp. XT.TT. — Bar of Steel from Messrs. Turton & Sons, Sheffield. Dimension 

 of bar -995 inch square. Length bet^-een supports 4 feet 6 inches. 

 Mark on bar, " G." 



Results of Exp, XLII. 



Here the weight («') at the limit of elasticity is 960 lbs., and the corre- 

 sponding deflection (^) is 1-290. 



By foi-mula (6).— The mean value of the deflection for unity of pressure 

 and section (DJ = -001205. 



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

 = 30,898,000. 



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

 pressure = 31,325,000. 



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

 = 51^600. 



By formula (9). — Work of deflection (n) for unity of section = 52^120. 



By foi-mida (12). — Value of C, the unit of working strength = 5^161 tons. 



