ON THI>MECHANICAL PROPERTIES OF STEEL. 



261 



Exp. XXIX.-- -Bar of Steel from Messrs. Bessemer & Co., Sheffield. Mark 



on bar, « B S 2." 



Before experiment. 



jj-uigiiL (ji speciuieii 1-01 inch. 



Diameter of specimen .... -72 inch. 

 Area of specimen '40715 sq. in. 



Height of specimen 



After experiment, 

 •572 inch. 

 •856 inch. 

 •57549 sq 



m. 



Results. — Here the strain per square inch (P,) causing rupture is 225,568 

 lbs., or 100^7 tons ; and the corresponding compression (?J per unit of length 

 is ^443. By formula (13).— The work (m) expended in producing rupture 

 = 49846. 



Exp. XXX.— Bar of Steel from Messrs. Bessemer & Co., Sheffield. 



on bar, " B S 3." 



Mark 



Before experiment. 



Height of specimen 1-002 inch. 



Diameter of specimen .... -72 inch. 

 Area of specimen ^40715 sq. in. 



After experiment. 

 •532 inch. 

 -894 inch. 

 •62771 sq. in. 



Results. — Here the strain per square inch (PJ causing rupture is 225,568 

 lbs., or 100-7 tons; and the eorre.sponding compression (ZJ per unit of length 

 is -473. By formula (13). — The work (u) expended in producing rupture 

 = 53222. 



