ON THE MECHANICAL PROPERTIES OF STEEL. 



115 



TEAITSVEESE STRAIN. 



Exp. IX. — Bar of Steel from the Barrow Hasmatite Steel and Iron Company. 

 Dimension of bar 1-042 inch square. Length between supports 4 

 feet 6 inches. Mark on bar, " H 6 + ." 



Results of Exp. IX. 



Here the weight (w) at the limit of elasticity is 772 lbs., and the corre- 

 sponding deflection (l) is 1-07. 



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

 and section (Dj) = -001595. 



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

 = 24,580,000. 



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

 pressure = 23,550,000. 



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

 = 34-42. 



By formula (9). — ^Work of deflection (u) for unity of section = 31-73. 



By formula (12). — Value of C, the unit of working strength = 4-112 tons. 



1 IJ 



