ON THE MECHANICAL PROPERTIES OF STEEL. 



176 



Exp. 



X. Bar of Steel from Messrs. Charles Cammell & Co., Sheffield. 



Dimension of bar 1-054 inch square. Length between supports 4 

 feet 6 inches. Mark on bar, " 1." 



Results of Eaj}. X. 



Hero the weight (w) at the limit of elasticity is 1400 lbs., and the corresponding deflec- 

 tion (5) is 1-562. By formula (6). — The mean ralue of the deflection for unity of pres- 

 sure and section (Dj) — -OOlSOSl. By formula (7).— The mean Tahie of the modulu.s of 



elasticity (E) = .30,088,000. By formula (2).— The modulus of elasticity (E) corre- 

 sponding to 112 lbs. prcssvu-e = 29,996,000. By formula (8).— Work of deflection (U) 



for unity of section = 95-000. By formula (9).— Work of deflection {u) for unity of sec- 

 tion =85-515. By formula (12).— Value of C, the unit of working strength = 7-504 tons. 



