ON THE MECHANICAL PROPERTIES OF STEEL. 



179 



TEANSVEK8E STHArfir. 



Exp. XIV.— Bar of Steel from Messrs. Charles Cammell & Co., Sheffield. 

 Dimension of bar 1-02 inch square. Length between siipports 

 4 feet 6 inches. Mark on bar, " 5." 



Results of Exp. 5IV. 



Here the weight {w) at the limit of elasticity is 810 lbs., and the corre- 

 sponding deflection (^) is 1-000. 



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

 and section (DJ = -0012805. 



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

 = 30,742,000. 



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

 pressure = 33,205,000. 



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

 = 33-750. 



By formula (9). — Work of deflection («) for unity of section = 32-439. 



By formula (12).— Value of C, the unit of working strength = 4-588 tons. 



o2 



