ON THE MECHANICAL PROPERTIES OF METALS. 



99 



Table X.— Tenth Melting. 



This melting and the next present perfect uniformity throughout the 

 whole surface of the fracture. The porosity in the centre has entirely dis- 

 appeared, and the remarkable feature of these castings is, that of a firm 

 grained iron, rather hard, but susceptible of being worked under the chisel 

 and file. 



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



Specific 

 gravity. 



Breaking 



weight 



(6). 



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 I 7-108 



Experiment 3, bar 4 ft. 6 in. between 

 supports 



Mean . 



7-108 



552-9 

 616-1 

 531^8 



56G-9 



1-62 

 1-74 

 1-52 



1-626 



895-6 

 1072-0 

 808-3 



921-7 



H 2 



