ON THE MECHANICAL PROPERTIES OF STEEL. 



253 



Exp. XIII.— Bar of Steel from Messrs. Cammell & Co., Sheffield. Mark 



on bar, " 4." 



Before experiment. After experiment. 



Height of specimen 1-001 inch -704 inch. 



Diameter of specimen '72 inch. .... '80 inch. 



Area of specimen -40715 sq. in -50265 sq. in. 



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

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

 is -303. By formula (13). — The work (m) expended in producing rupture 

 =34171. 



Exp. XIY. — Bar of Steel from Messrs. Cammell & Co., ShefSeld. Mark 



on bar, « 5." 



Before experiment. After experiment. 



Height of specimen ^996 inch '579 inch. 



Diameter of specimen ^72 inch. .... '865 inch. 



Area of specimen '40715 sq. in '58765 sq. in. 



37438 

 44966 

 52166 

 58950 

 66022 

 73134 

 80214 

 88134 

 91840 



16-713 

 20-074 



23-288 

 26-316 

 29-474 

 32-649 

 35-809 

 39-345 

 41-000 



91951 

 110440 

 128124 

 144786 

 162156 

 179722 

 197023 

 216465 

 225568 



41^049 



49-303 

 57-198 

 64-637 

 72-391 

 80-233 

 87-952 

 96-636 

 100-700 



•060 

 •095 

 •143 

 •199 

 •268 

 •317 

 •406 

 •415 

 •433 



'No cracks 



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

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

 is •433. By formula (13). — The work (m) expended in producing rupture 

 =48721. 



