8 Trans. Acud. Sti. uf St. Louis 



iiicasiirc for tlio i)ros|)ority of tlic ontiro chcmifal indus- 

 try, since siiljdmric acid is used for many chonrK-al jn'o- 

 cessos. The followintc tabic i;ives the production of aul- 

 pliuric acid in the I'nited States in the hist ten years. 



SULPHURIC ACID 50' Be.* 



Date 



1912 

 1913 

 1914 

 1915 

 1916 

 1917 

 1918 

 1019 

 1920 



•The Mineral Industry, 1920. G. A. Rouah, Editor, McGraw-Hill N. Y.. 1921. 



For many centuries fine porcelain ware was made in 

 China and Persia. Art collectors search eagerly for 

 specimens of old manufacture, and ))raise them as ])rod- 

 ucts of a lost art which they represent as flourishiiiLC cen- 

 turies aj?o, and small vessels and vases are sold for 

 thousands of dollars. The fact is that kaolin of a cer- 

 tain composition was used in tiiese j^oods. Kaolin comes 

 in pockets and in isolated mines, and if the mine was 

 exluiusted, the nit was lost. The chemist of today has 

 analyzed kaolin and ascertained its composition. By 

 ])ro])erly mixing materials he has learned to rei)roduce 

 the finest quality of porcelain at will. 



We mine in Arkansas bauxite ( Al.O. 2II..0), a mineral 

 containini^ almost pure alumina. Wf sliiji it to St. Louis, 

 where by th(> aid of cheap limestone and coal the impur- 

 ities are removed in one of the lar.i^est manufacturing: 

 ])lants of the country, and juire alumina is made from it. 

 This we carry to Niagara Falls to produce aluminium 

 by an electrical ])rocess. The ij^reat discovery of ])roduc- 

 iuix aluminium, made by Woehler in 1827, has been 

 improved by Hall, an American chemist. He isolates 

 the metal by an electrical process, and a large i)art of the 



