ON THE MECHANICAL PROPERTIES OF STEEL, 



177 



TEANSTERSE STRAIN. 



Exp, XII.— Bar of Steel from Messrs, Charles CammeU & Co., Sheffield, 

 Dimension of bar ^994 inch square. Length between supports 

 4 feet 6 inches. Mark on bar, " 3." 



Besults of Exp. XII. 



Here the weight (w) at the limit of elasticity is 1210 lbs., and the corre- 

 sponding deflection (2) is 1-594. 



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

 and section (DJ = -0012612. 



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

 = 31,212,000. 



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

 pressure =31,474,000. 



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

 = 77-864, 



By formula (9). — ^Work of deflection (m) for uuity of section = 78-825, 



By formiila (12). — Yalue of C, the iinit of working strength = 7-413 tons, 

 1867. 



