ON THE MECHANICAL PROPERTIES OF STEEL. 



19? 



TEANSVEESE STRAIN. 



Exp. XX X . — Bar of Steel from Messrs. Bessemer & Co., Sheffield. Dimen- 

 sion of bar -957 X -966 inch. Length between supports 4 feet 6 

 inches. Mark on bar, " B S 3." 



Results of Exp. XXX. 



Here the weight (w) at the limit of elasticity is 710 lbs., aud the cor- 

 responding deflection (^) is 1^094. 



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

 and section (D,)=^0015293. 



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

 =29,310,000. 



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

 pressure=28,536,000. 



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

 =32-304. ^ 



By formula (9).— Work of deflection (n) for unity of section =35-008. 



By formula (12).— Value of C, the unit of working strength =4- 778 tons. 



i'2 



