ON THE MECHANICAL PROPERTIES OF METALS. 



101 



Table XII.— Twelftli Melting. 



There is a marked difl'erence in these bars when compared with those from the earlier 

 meltings. Their resisting powers to strain have been nearly doubled, when compared with 

 those obtained direct from the pig, or from the second, third, or fourth meltings ; and 

 upon a careful examination of the fracture by the microscope, the same indications of a 

 strong adhesive force is observable, accompanied with a finely-grained texture, which the 

 fracture of each bar presents. The colour is a light gray. 



Results reduced to those of bars 1"00 in. square. 



Specific 

 gravity. 



Breaking 

 weight 



Ultimate 

 deflection 



Product b X 



d, or power 



of resisting 



impact. 



Experiment 1, bar 4 ft. 6 in. between 

 supports 



Experiment 2, bar 4 ft. 6 in. between 

 supports 



Expeiiment 3, bar 4 ft. 6 in. between 

 supports 



Mean 



7160 



649-8 

 756-7 

 670 



160 

 1-77 

 1-63 



7^160 



6921 



1-666 



1039-6 

 1339-3 

 1092-1 



1153 



