Comparative Essays for cupellation^ made at Lautcnthal, 1th October, 1829. 



Substances employed. 



Substances (ashes, 1 Running 



With 

 raarne 





With ashes. 

 With inarne. 

 With ashes. 

 tons."\ 



Calcined 13 I 



tons. | 

 Not calcined 5^J 



marne) forming the 

 Cupel bottoms. 



quints 



112 



112 

 112 



of the 

 Litharge. 



hours. 



Silver obtained, 

 not refined. 



marks. lots. 



Poor 

 Litharge. 



21 

 22 

 21 



1 

 13 



23 



6 



qts 



69 



87 

 69 



86 



Rich 



Litharge. 



qts. 



3 



1 

 2 



1 





Cupel 

 bot- 

 toms. 



qts. 



~~3T~ 

 14 

 31 





Abstrichs. 



Contents of the 

 Cupel bottoms. 



qts. 



8 



9 



11 



14 



tons. 



4 

 5 

 4 



himpten. 



2 

 3 

 2 



11 



5 



2 



Lead. 

 lbs. 



89 



80 

 90 



78 



Essays made at Lautcnthal for the Fusion of Mattes with Limestone. 



Agents employ- 

 ed for the reduc- 

 tion of the sul- 

 phuret of lead. 



Mixtures. 



Product. 



Iron, 



Limestone, 





Time. 



Matts 



hours. 



qts. 



316 

 316 



3360 

 8360 



Scoria. 



H-3 



qts. qts. qts 



630 



315 

 15 



00 



qts. 



192 100 



qts 



1528 

 i 172 



u 





m 



o 



GO 



qts. 



1005 

 1107 



qts. 



4416 

 4608 



These products contain per quintal 



Combustible. 



Lead. 



Silver. 



lots. 



3-3£ 

 3 



Mattes. 



Lead. 

 lbs~ 



52-55 



50-53 



Silver 

 lots. 



1|-2| 



Scoria. 





Le ad . 

 lbs. 



6-11 



6-14 



Silver- 

 lots. 



Coke. Charcoal. 



• • 



* • 



balgen. 



1705 

 1695 



maas. 



50 

 50 



Silver, 

 lots. 



* 



i 



Pine apples. 



maas. 



156 

 144 



•s 





.* 



These results prove that the iron acts rather more energetically than the limestone. The quantity of lead containing 

 silver is less, and the matte rather more ; however this difference is more than counterbalanced by the use of lime- 

 stone. 



to 



