ON THE MECHANICAL PROPERTIES OF METALS. 



105 



Table XVI.— Sixteenth Melting. 



l(«ulL^J^ 



In this melting the process of deterioration goes on rapidly ; 

 the whole surface of the fracture (with the exception of a circle 

 of closely granulated gray iron, about one quarter of an inch in 

 diameter) is a white silvery formation pressing hard upon the in- 

 ternal core of gray iron, as shown in the figure. The most re- 

 markable feature of the process is the fine frosty appearance of the 

 external surface of the bars, and the extreme hardness of this 

 portion of the metal, on which the best cast-steel makes no im- 

 pression. 



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



Experiment 1, bar 4 ft. 6 in. between 

 supports 



Experiment 2, bar 4 ft. 6 in. between 

 supports 



Experiment 3, bar 4 ft. 6 in. between 

 supports 



Mean 



Specific 

 gravity. 



7-330 



7-330 



Breaking 

 weight 



353^7 

 350^4 

 3501 



351-3 



Ultimate 

 deflection 



id). 



0^56 

 0-60 

 0-53 



0-566 



Product b X 



d, or power 



of resisting 



impact. 



198 



224-2 



185-5 



198-1 



