216 



REPORT 1S67. 



TKANSTEESE STRAIN. 



Exp. LI. — Bar of Steel from the Barrow Haematite Co., Fiimess. Dimen- 

 sion of bar -995 inch square. Length between supports 4 feet 

 6 inches. Mark on bar, " H 2." 



Results of Exji. LI. 



Here the weight (w) at the limit of elasticity is 510 lbs., and the corre- 

 sponding deflection (r) is -682. 



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

 and section (Dj)= -001280. 



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

 =30,754,000. 



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

 pressure = 34,443,000. 



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

 = 14-242 



By formula (9). — "Work of deflection (u) for unity of section =14-383. 



By formula (12). — Value of (C), the unit of working strength =3- 108 I 

 tons. 



