183 



KEPORT 1867. 



TBANSTEESE STRAIN. 



Exp. XVII. — Bar of Steel from Messrs, Naylor & VIckers, Sheffield. Di- 

 mension of bar '998 inch square. Length between supports 4 feet 

 6 inches. Mark on bar, " Tyre Steel." 



Results of E.vp. XVII. 



Here the weight (w) at the limit of elasticity is 910 lbs., and the corre- 

 sponding deflection (2) is 1-197. 



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

 and section (D^) = -0013124. 



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

 =29,994,000. 



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

 pressure=27,847,000. 



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

 =40-025. 



By formula (9). — Work of deflection (?() for unity of section =40 -184. 



By formula (12). — Value of C, the unit of working strength= 5-505 tons. 



