176 



REPORT 1867. 



Exp. XI. — Bar of Steel from Messrs. Charles Cammell & Co., Sheffield. 

 Dimension of bar 1-104 inch square. Length between supports 4 

 feet 6 inches. Mark on bar, " 2." 



Results of E.vp. XI. 



Here the weight (w) at the limit of elasticity is 1460 lbs., and the corresponding deflection 



(5) is 1-684. By formula (6). — The mean value of the deflection for unity of pres.sure 



and section (Dj) = -001637. By formula (7 1. — The mean value of the modulus of elas- 

 ticity (E) = 22,965,000. ■ By formula (2). — The modulus of elasticity (E) corresponding 



to 112 lbs. pressure = 24,288,000. By formula (8).— Work of deflection (U) up to the 



limit of elasticity = 102-443. By formula (9). — Work of deflection (m) for unity of sec- 

 tion = 84 048. By formula (12). — Value of C, the unit of working strength = 5-904 tons. 



