ON THE MECHANICAL PllOPEKTIES OF STEEL. 



117 



TRANSVERSE STRAIN. 



Exp. XI. — Bar of Steel from the Hcaton Steel and Iron Company, Langley 

 Mills. Dimension of bar l-U-ii x '028 inch. Length between sup- 

 ports 4 feet 6 inches. Mark on bar, " 2." 



Results of Exp. XI. 



Here the weight (w) at the limit of elasticity is 1444 lbs., and the corre- 

 sponding deflection (^) is 1-801. 



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

 and section (DJ = -001354. 



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

 = 29,070,000. 



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

 pressure = 29,640,000. 



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

 = 108-4. 



By formula (9). — Work of deflection (it) for unity of section = 101-1. 



By formula (11). — Yalue of C, the unit of working strength = 7-879 tons. 



