ON THE MECHANICAL PROPERTIES OF STEEL. 



119 



TBANSVEESE STEAIN. 



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

 Mills. Dimension of bar 1-008 x 1-012 inch. Length between sup- 

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



Besults of Exp. XIII. 



Here the weight (w) at the limit of elasticity is 1388 lbs., and the corre- 

 sponding deflection (^) is 1*769. 



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

 and section (DJ = -001295. 



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

 = 30,400,000. 



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

 pressure = 35,120,000. 



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

 = 102-3. 



By formula (9). — Work of deflection (u) for unity of section = 100-3. 



By formula (11). — Value of C. the unit of working strength = 8-094 tons. 



