120 



REPORT 1869. 



TRANSVERSE STRAIN. 



Exp. XTV. — Bar of Steel from the Heaton Steel and Iron Company, Langley 

 Mills. Dimension of bar 1-025 x 1"02 inch. Length between sup- 

 ports 4 feet 6 inches. Mark on bar, " 5." 



Results of Exp. ^lY. 



Here the weight (w) at the limit of elasticity is 1276 lbs., and the corre- 

 sponding deflection (^) is 1-607. 



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

 and section (DJ = -001351. 



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

 = 29,140,000. 



By formula (1). — The modulus of elasticity (E) corresponding to 112 lbs. 

 pressure = 31,140,000. 



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

 = 85-44. 



By formula (9). — Work of deflection {u) for unity of section = 81-60. 



By formula (11). — Yalue of C, the unit of working strength = 7*209 tons. 



