ON THE MECHANICAL PROPERTIES OF STEEL. 



203 



TKANSTEHSE STRAIN. 



Exp. XXXYIII.— Bar of Steel from Messrs, Turton and Sons, Sheffield. 

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

 6 inches. Mark on bar, " C." 



Eesitlfs of Exp. XXXYIII. 



Here the ■weight (if) at the limit of elasticity is 1100 lbs., and the cor- 

 responding deflection (3) is 1-415. 



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

 and section (D^) = -0012598. 



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

 = 31,247,000. 



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

 pressure = 31,859,000. 



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

 = 65-443. 



By formula (9). — Work of deflection («) for unity of section = 65-705. 



By formula (12). — Value of C, the unit of working; strength = 6-718 tons. 



