116 



REPORT 1869. 



XEANSVEESB STBAXN. 



Exp. X. (April 1869). — Bar of Steel from the Heaton Steel and Iron Company, 

 Langley Mills. Dimension of bar 1-018 x 1"04 inch. Length between 

 supports 4 feet 6 inches. Mark on bar, " 1." 



Besults of Exp. X. 



Here the weight (w) at the limit of elasticity is 1251 lbs., and the corre- 

 sponding deflection (2) is 1-693. 



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

 and section (DJ = -001481. 



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

 = 26,580,000. 



By formula (1). — The modulus of elasticity (E) corresponding to 112 lbs. 

 pressure = 26,060,000. 



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

 •^88-2,5. 



By formula (9). — Work of deflection (?;) for unity of section = 83-410. 



By formula (11).— Value of C, the unit of working strength = 6-831 tons. 



