168 



REPORT— 18G7. 



TRANSVERSE STRAIN. 



Exp. III. — Bar of Steel from Messrs. John Brown & Co., Sheffield. Dimen- 

 sion of bar 1-001 inch square. Length between supports 4 feet 

 6 inches. Mark on bar, "B 3." 



Results of Ed-p. III. 



Hero the weight (w) at the limit of elasticity is 1160 lbs., and the corre- 

 sponding deflection (Z) is 1-507. 



By formula (0). — The mean value of the deflection for unity of pressure 

 and section (Dj) = -0012891. 



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

 = 30,550,000. 



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

 pressure = 32,171,000. 



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

 = 72-838. 



By formula (9). — Work of deflection («.) for unity of section = 72-690. 



By formula (12). — Value of C, the unit of woiking strength = 6-958 

 tons. 



