364 



REPORT 1867. 



Exp. XXXV.— Bar of Steel from Messrs. Sanderson & Co., Sheffield. Mark 



^ " 



on bar, " S 5. 



Before experiment. 



Height of specimen I'Ol inch. 



Diameter of specimen "72 inch. 



Area of specimen •40715 sq. in. 



After experiment. 

 •678 inch. 

 •790 inch. 

 •49016 sq. in. 



Compres- 

 sion, in 

 inches. 



•030 

 •045 

 -063 

 •07^ 

 •138 

 •187 

 •246 

 •305 

 •333 



Eemark; 



Commenced 

 crack. 



Cracks widened 



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

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

 is •333. By formula (13). — The work (a) expended in producing rupture 

 = 37469. 



Exp. XXXVI.— Bar of Steel from Messrs. Turton & Sons, Sheffield. Mark 



on bar, " A." 



Before exi^eriment. After experiment. 



Height of specimen -988 inch. ' .... "71 inch. 



Diameter of specimen -72 inch. .... "781 inch. 



Ai-ea of specimen -40715 inch "47783 sq. in. 



1 

 2 

 3 



4 

 5 

 6 



7 

 8 

 9 



37438 

 44966 

 52166 

 58950 

 66022 

 73134 

 80214 

 88134 

 91840 



10-713 

 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 



•020 

 -035 

 -043 

 •069 

 •108 

 •157 

 •206 

 •265 

 •283 



No cracks 



Eesulfs. — Here the strain per square inch (Pj) causing nipture is 22.5,.568 

 lbs., or 100-7 tons ; and the corresponding compres.sion (7J per unit of length 

 is -283. By formula (13). — The work (it) expended in producing rupture 

 =31843. 



1 



