Cast Iron, Steel, a?id Malleable Iron. 521 



Or to calculate it centesimally, 



Silicon 1-0090 



Aluminum. . . . . . 0'0606 



Manganese 0-2412 



Arsenic O'OOOO 



Antimony 0-0000 



Tin 0-0000 



Chromium 1-3820 



Phosphorus 3-1848 



Sulphur 1-1050 



Azote 0-7202 



Carbon 1-9100 



62-7282 



^'"°" ' 27-5566 



{■ 



Loss 00-1023 



100-0000 

 I only state here briefly, that in order to separate chromium, 

 iron, phosphorus and alumina, I proceeded in the usual way, 

 — by melting the first-dissolved and evaporated quantity of 

 iron to be analysed with carbonate of soda in a platinum cru- 

 cible, and dissolving the fused mass in distilled water. The 

 solution contained the phosphoric acid, the chromium, and a 

 little alumina and silica; the remainder was oxide of iron, 

 silica and alumina, and a little alkali. 



The solution kept quiet for some time in a dish covered 

 with paper, in order to allow the manganese to separate, was 

 neutralized with nitric acid and evaporated to dryness. After 

 having been moistened by nitric acid and dissolved again, the 

 silica was left behind. The filtered liquor, neutralized with 

 ammonia, let fall a basic phosphate of alumina. From the 

 again filtered liquor, acidulated with acetic acid, acetate of 

 lead precipitated phosphoric acid, sulphuric acid and chro* 

 mium in combination with oxide of lead. Hydrochloric acid 

 and alcohol separated the chromium from the precipitate, 

 which consisted now only of phosphate of lead, sulphate of 

 lead, and chloride of lead. From the solution, freed by means 

 of sulphuretted hydrogen from all traces of lead, ammonia 

 threw down the chromium in the state of oxide. 



We here see a new feature in white iron; the carbon of white 

 coke-iron is always combined with a constituent hitherto to- 

 tally overlooked, that is, azote. No white coke-iron which I 

 analysed was free from it, nor any gray iron free from alumi- 

 num. 



Tne best English cast steel as well as wootz and malleable 

 iron^ possesses the same property of being combined with azote. 

 Now as malleable iron produced from gray pig iron contains 



