ON THE MECHANICAL PROPERTIES OP STEEL. 



185 



TKANSYEESE STRAIN. 



Exp. XX.— Bar of Steel from Mr. S. Osborn, Clyde Works, Sheffield. Di- 

 mension of bar 1-03S inch square. Length between supports 4 feet 

 6 inches. Mark on bar, " 1. Best Tool Cast Steel, ^ ■ " 



Results of Exp. 



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

 responding deflection (l) is 1-204. 



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

 and section (DJ=-0013886. 



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

 =28,353,000. 



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

 pressure=26,689,000. 



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

 =50-668. 



By formula (9). — Work of deflection {\i) for unity of section =48-813. 



By formula (12). — Value of C, the unit of working strength =5-432 tons. 



