34 



BULLETIN 42, UNITED STATES NATIONAL MUSEUM. 



The operatiou of the process is illustrated by the following scheme, 

 figure 2 : 



f J?ick 



IlMuciit iSiZfiaele 

 Ores 



0f:e3 



aorn 



ryviCe,lmLaw: 

 Flu. c 



Ores 



Wb 3/aiie. 



Fzc s iozL 



731 



-Ti^e.c.i'ed. 



MckSL^ 



Isl Ma22e 

 T 



Tu. siozL 



H 



Toot 



IIiASIg 



2ni Malle 



Z 



and. Caa^d ibr 



GoloL 



Tils i 071 



II 



roov 



^ickSlag 



-.TT^/'ecfcct 



i 





tf SiZutr IT) 



Iksidm 



MaKon. 



ifMi 



HelUR 



-on," 



CM, 



MeUe.a. 

 defined 







t-JgtjttiTtA 



Fig. 2. 

 Scheme showing Ziervogel process. 



The collection was prepared by Mr. Richard Pearse, metallurgist 

 of the works and shows a full series of the ores treated and each step la 

 the operation. 



