ON THE MECHANICAL PROPERTIES OF STEEL. 



109 



TRANSTEESE STEAIlf. 



Exp. III. — Bar of Steel from the Barrow Haematite Steel Company. Dimen- 

 sion of bar 1-01 inch square. Length between supports 4 feet 

 6 inches. Mark on bar, " H 3. Soft." 



Results of Exp. III. 



Here the weight (w) at the limit of elasticity is 610 lbs., and the corre- 

 sponding deflection (5) is •793. 



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

 and section (Dj) = ^001319. 



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

 = 29,717,000. 



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

 pressure = 32,717,000. 



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

 = 20-155. 



By formula (9). — Work of deflection {u) for unity of section = 19-757. 



By formula (12). — Value of C, the unit of worlung strength = 3*540 tons. 



