180 



REPORT — 1867. 



TEANSVEESE STRAIN. 



Exp. XV.— Bar of Steel from Messrs. Charles CammeU & Co., Sheffield. 

 Dimension of bar -992 inch square. Length between supports 

 4 feet 6 inches. Mark on bar, " 6." 



Results of Exp. XV, 



Here the weight (w) at the limit of elasticity is 810 lbs., and the cor- 

 responding deflection, {I) is 1-098. 



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

 and section (DJ= -0012995. 



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

 pressure=30,291,000. 



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

 pressure=31,056,000. 



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

 =37-057. 



By formula (9).^ — Work of deflection (m) for unity of section =37-657. 



By formula (12).— Value of C, the unit of working strength=4-988 tons. 



