186 



REPORT 1867. 



TEANSTEESE STRAIN. 



Exp. XXI.— Bar of Steel from Mr. S. Osborn, Clyde Works, Sheffield. Di- 

 mensiou of bar 1-01 x 1-014 inch. Length between supports 4 feet 

 6 inches. Mark on bar, " 2. Best Chisel Cast Steel." 



Results of Exp. XXI. 



Here the weight {w) at the limit of elasticity is 1110 lbs., and the cor- 

 responding deflection (S) is 1-388. 



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

 and section (Dj)= -001278. 



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

 =30,802,000. 



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

 pressure=30,523,000. 



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

 = 64-195. 



By formula (9). — Work of deflection («) for unity of section = 62-684. 



By formula (12). — Value of C, the unit of working strength = 6-400 tons. 



