138 REPORT— 1869. 



Exr. XIII. — Bar of Steel from the Heatou Steel and Irou Coinpauy, Langley 



Mills. Mark ou bar, " 4." 



Before experiment. After experiment. 



Height of specimen 1-00 inch. .... -784 inch. 



Diameter of specimen -72 inch. .... '864 inch. 



Area of specimen -4071 sq. in -5863 sq. in. 



No. 



of 



Exp. 



1 

 2 

 3 

 4 

 5 

 6 

 7 



Weight laid 



on 

 specimen. 



lbs. 

 44G0G 

 52030 

 59102 

 60662 

 74390 

 81558 

 88726 

 91840 



tons. 

 19-913 

 23-227 

 26-384 

 29-759 

 33-209 

 36-409 

 39-609 

 41-000 



Weight laid 



on per square inch 



of section. 



lbs. 

 109572 

 127806 

 145178 

 163748 

 182731 

 200339 

 217946 

 225568 



tons. 

 48-916 

 57-056 

 64-811 

 73-101 

 81-576 

 89-437 

 97-297 

 100-700 



Com- 

 pression, 

 in inches. 



•050 

 -070 

 •080 

 •120 

 -IGO 

 -190 

 •230 

 •247 



Eeniarks. 





No cracks. 



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

 or 100^7 tons, and the corresponding compression (/,) per unit of length 

 is -247. By formula (13).- — The work («) expended in producing rupture 



= 27857. 



Exp. XIV. — Ear of Steel from the Heaton Steel and Irou Company, Langley 



Mills. Mark on bar, " 5." 



Before experiment. 



Height of specimen 1-00 inch. 



Diameter of specimen -72 inch. 



Area of specimeu -4071 sq. in. 



After experiment. 

 •78 inch. 

 •87 inch. 

 •5944 sq. in. 



1 

 2 

 3 

 4 

 5 

 6 



44606 

 52030 

 59102 

 66662 

 74390 

 81558 

 88726 

 91840 



19^913 

 23^227 

 26-384 

 29-759 

 33-209 

 36-409 

 39^609 

 41^000 



•050 

 •070 

 •090 

 •120 

 •106 

 •200 

 •240 

 •257 



No cracks. 



or 



Bemlts.—Rexe the strain per square inch (P,) causing rupture is 225,568 lbs., 

 100-7 tons, and the corresponding compression (/,) per unit of length 



= 28985. 



By formula (13). — The work («) expended in producing rupture 



