ON THE MECHANICAL PROPERTIES OF STEEL. 



181 



TRANSVERSE STRAIN. 



Exp. XVI.— Bar of Steel from Messrs. Naylor & Vickers, Sheffield. 

 Dimension of bar 1 inch, square. Length between supports 4 feet 

 6 inches. Mark on bar, " Axle Steel." 



Results of Exp. XVI. 



Here the weight (iv) at the limit of elasticity is 910 lbs., and the cor- 

 responding deflection (S) is 1-180. 



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

 and section (DJ = -001273. 



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

 =30,923,000. 



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

 pressure =30,940,000. 



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

 ==.44-741. 



By formula (9). — ^^Vork of deflection (u) for unity of section =44- 741. 



By formula (12). — Yalue of C, the unit of working strength= 5-472 tons. 



