102 



REPORT 1853. 



Table XIII.— Thirteenth Melting. 



This iron presents a singular admixture of exceedingly sharp angulai- crystals, closely 

 packed upon each other, and so tightly compressed as to give indications of great hardness. 

 This is, however, not the case, as it yields to the action of the file, but not without difliculty, 

 by taking the sharp edge of the teeth. In other respects it is a strong close-grained iron, but 

 inferior to the twelfth melting, which is rather more ductile and more elastic. 



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



Specific 

 gravity. 



Breaking 



weight 



(4). 



Ultimate 



deflection 



id). 



Product * 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 



Experiment 3, bar 4 ft. 6 in. between 

 supports 



Mean 



7'134 



6371 1-62 



656-6 1-64 



610-7 I 1-68 



7-134 



634-8 



1-646 



1032-1 

 1076-8 

 1025^9 



1044^9 



