ON THE MECHANICAL PROPERTIES OF STEEL. 



187 



TEAjSTSTEESE steain. 



Exp. XXII.— Bar of Steel from Mr. S. Osborn, Clyde Works, Sheffield. 

 Dimension of bar 1"09 inch square. Length betAveen supports 

 4 feet 6 inches. Mark on bar, " 3. Silver Steel, 



Results of Exp. XXII. 



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

 responding deflection (^) is 1-290. 



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

 and section (D^) = -0017814. 



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

 = 22,098,000. 



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

 pressure = 22,072,000. 



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

 = 54-287. 



By formula (9). — Work of deflection (m) for unity of section = 47-845. 



By formula (12). — Value of C, the unit of working strength = 4-691 tons. 



