Powel ] 9Q [October. 



I send you also the analysis of the white pig of the New Jersey 

 Zinc Company. 



Iron, 88.30 



Carbon, chemically combined, .... 5.48 



Carbon, free or graphite, ..... 0.00 



Silicum (sic), 0.20 



Manganese, 4 50 



Sulphur, 0.08 



Phosphorus, 0.15 



Zinc, 0.30 



Loss, 0.99 



100.00 



This curious iron has become in my eyes still more important, since 

 I found a recent notice of Mr. Krupp, of Essen in Prussia, who has 

 sent to the London Exhibition some important productions of his 

 wonderful steel works, such as huge ordnance, shafting, &c. The 

 notice of Krupp states, that his steel is produced from a German ore 

 of zinc and iron, and it, doubtless, therefore must resemble this 

 Franklinite of New Jersey. I need make no remark in this connec- 

 tion, to convince you of the immense importance of a production 

 which may possibly enable America to enjoy the advantages of such 

 manufactures as those of the Essen Works, which are now without 

 a rival in the world. 



I may add that the malleable iron stirrup was made by Messrs. 

 Bruen, by the same process and side by side with other castings made 

 of the usual Sterling white iron. The Sterling iron made cold, tough, 

 malleable castings, and our new iron made them all like the stirrup. 

 For these malleable articles, the pig iron is first melted in an air fur- 

 nace on the hearth, and cast into plates, which are broken up and 

 re-melted in a cupola for casting. 



Another remarkable, and I believe, unique property of the white 

 pig iron, has been made the subject of a patent. The pig iron, when 

 coarsely pulverized, and sprinkled upon a bar of wrought iron, heated 

 quite red, or approaching white, melts, forms a union with the sur- 

 face, and flows entirely over it, producing a sort of case-hardened 

 enamel, which resists the edge of tools. 



It occurs to me that this property might be of use in uniting such 

 enamelled surfaces to cast iron, poured upon them in the mould, or 

 for various other purposes. 



Dr. Emerson referred to a pamphlet recently published by 



