114 



REPORT 1869. 



TKAJSrSVEBSE STRAIN. 



Exp. VIII. — Bar of Steel from the Barrow Haematite Steel Company. Di- 

 mension of bar 1-051 inch square. Length between supports 4 feet 

 6 inches. Mark on bar, " H 5 + ." 



Results of Exp. VIII. 



Here the weight (w) at the limit of elasticity is 772 lbs., and the corre- 

 sponding deflection (o) is 1-058. 



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

 and section (Dj) = -001658. 



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

 = 23,740,000. 



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

 pressure = 25,720,000. 



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

 = 34-03. 



By formula (9). — "Work of deflection (w) for unity of section = 30*81. 



By formula (12). — Value of C, the unit of working strength = 4-108 tons. 



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