184 



REPORT 1867. 



TEANSTEESE STEAIN. 



Exp. XIX.— Bar of Steel from Messrs. Naylor & Tickers, Sheffield, Di- 

 mensions of bar 1-01 inch square. Length between supports 4 

 feet 6 inches. Mark on bar, " Naylor & Vickers' Cast Steel, 2-66." 



Results of Exp. XIX. 



Here the weight (iv) at the limit of elasticity is 1260 lbs., and the cor- 

 responding deflection (h) is 1-570. 



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

 and section (Dj)= -0012789. 



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

 =30,788,000. 



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

 pressure = 29,752,000. 



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

 =82-412. 



By formula (9). — Work of deflection (m) for unity of section =80-788. 



By formula (12). — Value of C,. the unit of working strcngth= 7-358 tons. 



