ON THE MECHANICAL PROPERTIES OF STEEL. 



1.21 



TEANSVERSE STRAIN. 



Eip. XV. — Bar of Steel from the Heaton Steel and Iron Corapauy, Langley 

 MiUs. Dimension of bar 1-02 x 1'02 inch. Length between sup- 

 ports 4 feet 6 inches. Mark on bar, " 6." 



Besults of Exp. XV. 



Here the weight {iv) at the limit of elasticity is 1220 lbs., and the cor- 

 responding deflection (^) is 1-578. 



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

 and section (DJ = -001372. 



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

 = 28,090,000. 



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

 pressure = 27,590,000. 



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

 = 80-21. 



By formula (9). — Work of deflection (u) for unity of section = 77-13. 



By formula (12). — Value of C, the unit of working strength = 6-925 tons. 



