ON THB MECHANICAL PROPEETIES OF STEEL. 



171 



TEANSVEESE STRAIN. 



Exp. VI. — Bar of Steel from Messrs. John Brown & Co., Sheffield. Dimen- 

 sion of bar -992 inch square. Length between supports 4 feet 

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



Beaults of Ex)). VI. 



Here the weight (tv) at the limit of elasticity is 860 lbs., and the cor- 

 responding deflection (g) is 1-174. 



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

 and section (DJ = -0013024. 



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

 = 30,224,000. 



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

 pressure = 32,361,000. 



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

 = 42-068. 



By formula (9). — Work of deflection (m) for unity of section = 42-749. 



By fonnula (12). — Value of C, the unit of working strength = 5-297 

 tons. 



