ON THE MECHANICAL PROPERTIES OF STEEL. 



113 



TRANSVERSE STRAIN. 



Exp. VII. — Bar of Steel from the Barrow Haematite Steel Company. Di- 

 mensiou of bar 1 inch square. Length between supports 4 feet 

 6 inches. Mark on bar, " H 4+ ." 



Eesults of Exp. YII. 



Here the weight (lu) at the limit of elasticity is 716 lbs., and the corre- 

 sponding deflection (l) is -968. 



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

 and section (Dj) = -001330. 



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

 = 29,600,000. 



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



pressure = 28,590,000. 



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

 = 28-28. 



By formula (9).— Work of deflection {u) for unity of section = 28-28. 



By formula (12),— Yalue of C, the unit of working strength = 4-315 tons. 



1869. 



