ON THE MECHANICAL PROPERTIES OP STEEL. 



205 



TRANSVERSE STRAIN. 



Exp. XL. — Bar of Steel from Messrs. Turton & Sons, Sheffield. Dimension 

 of bar 1*02 inch square. Length between supports 4 feet 6 inches. 

 Mark on bar, " E." 



Results of Exp. XL. 



Here the weight {tv) at the limit of elasticity is 1160 lbs., and the corre- 

 sponding deflection (o) is 1-402, 



By formula (0). — The mean value of the deflection for unity of j^ressure 

 and section (D^) =-001303. 



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

 = 30,211,000. 



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

 pressure = 30,764,000. 



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

 = 67-763. 



By formula (9). — "Work of deflection («() for unity of section = 65-131. 



By formula (12). — Value of C, the unit of working strength = 6-576 tons. 



