ON THE MECHANICAL PROPERTIES OF STEEL. 



191 



TEANSVEESE STEAHT. 



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

 Dimension of bar 1-02 inch in middle. Length between supports 

 4 feet 6 inches. Mark on bar, " 7. Extra Best Tool Cast Steel, < 



Results of Exp. XXYI. 



Herethe weight {iv) at the limit of elasticity is 1210 Ib.s., and the cor- 

 responding deflection (^) is 1-503. 



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

 and section (D^) = •001348. 



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

 = 29,188,000. ^ ^ 



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

 pressure = 28,013,000. 



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

 = 75-776. ^ 



By formula (9).— Work of deflection {u) for unity of section = 72-826. 



By formula (12).— Value of C, the unit of working strength = 6-860 tons. 



