118 



REPORT 18G9. 



TKANSVEESE STRAIN. 



Exp. XII. — Bar of Steel fi'om tlie Heaton Steel and Iron Company, Langley 

 Mills. Dimension of bar 1-022 X 1'013 inch. Length between sup- 

 ports 4 feet G inches. Mark on bar, " 3." 



Here the weight 

 spondiug deflection 



By formula (6).- 

 and section (DJ = 



By formida (7), 

 = 27,740,000. 



By formula (1).- 

 pressure = 26,160 



By formula (8) 

 - 105^9. 



By formula (9).- 



By formula (11) 



Results of Exp. XII. 



(w) at the limit of elasticity is 1398 lbs., and the corre- 

 ct) is 1-819. 



—The mean value of the deflection for unity of pressure 

 -001410. 



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



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



000. 



— "Work of deflection (U) up to the limit of elasticity 



—Work of deflection {u) for unity of section = 102-3. 

 — Value of C, the unit of working strength = 8-028 tons. 



I 



