ON THE MECHANICAL PROPERTIES OF STEEL. 



189 



TEANSVEESE STEAIN. 



Exp. XXIV.— Bar of Steel from Mr. S. Osboru, Clyde Works, Sheffield. 

 Dimension of bar 1-03 inch square. Length between supports 4 feet 

 6 inches. Mark on bar, " 5. Toughened Cast Steel for Shafts, &c." 



Besults of Exp. XXIV. 



Here the -weight {w) at the limit of elasticity is 1010 lbs., and the cor- 

 responding deflection (o) is 1-190. 



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

 and section (Dj) = -0013112. 



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

 = 26,398,000. 



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

 pressure = 29,610,000. 



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

 = 50-079. 



By formula (9). — "Work of deflection (i«) for unity of section = 53-194. 



By formula (12). — Value of C, the unit of working strength = 5-559 tons. 



