involved in the Construction of Artillery. 



387 



First specimen, from bar A, broke with 

 Second „ ,, ,, 



Mean, 



First specimen, from bar B, broke with 

 Second „ „ „ 



lbs. per Square Incb. 



45,359 

 45,359 



45,359 



50,930 

 46,155 



Mean 



" ' II From the same bar, drawn down under a welding heat:- 



48,542 



Iba. per Square Inch. 



One specimen, from bar A, broke with 39,375 



B, „ 49,338 



Mean 46,35(5 



Mean of six specimens from original bars, . . . 46,086 

 " ' III. — From the bar cut from the body of the gun: — 



First specimen from this bar, unaltered by heating or 



hammering, broke with 40,585 



Second specimen from this bar, unaltered by heating 



or hammering, broke with 36,606 



Mean, • 38,595 



One specimen from this same bar, drawn down under a welding 



heat, 52,521 



" ' In order to compare the iron used in the construction of the " Princeton's" gun 

 with other kinds of wrought iron, the following additional specimens were tested : — 



lbs. per Square Inch. 



Russia iron, the common flat bar, one specimen, .... 62,644 

 English rolled iron, from different bars — 



lbs. per Square Inch. 



Banke's, first specimen, 56,896 



,, second ,, 56,169 



Mean 56,532 



Low Moor, first specimen, 58,888 



„ second „ 53,317 



Mean, 56,103 



