172 



KEPOKT 1S67. 



TKANSTEESE 8TEAIX. 



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

 sion of bar '978 inch square. Length between supports 4 feet 

 6 inches. Mark on bar, " B 7." 



Mesults of Exp. VII. 



Here the weight (w) at the limit of elasticity is 860 lbs., and the corre- 

 sponding deflection (F) is 1-225. 



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

 and section (DJ = -0012643. 



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

 = 31,135,000. 



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

 pressure = 33,523,000. 



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

 = 43-900. 



By formula (9). — Work of deflection (u) for unity of section = 45-897. 



By formiila (12). — Value of C, the unit of Avorking strength = 5-527 

 tons. 



