112 GEOLOGICAL SURVEY OF ALABAMA 



Out of 70 per cent, of the mixture above described, 

 with an admixture of 30 per cent, of an ordinary plastic 

 clay, Mr. Brunt prepared specimen bricks which stood 

 the most rigid tests, having been finally subjected to a 

 temperature of 5,000 F. for three weeks in a steel melt- 

 ing furnace without showing any sign of fusing. 



The completion of the test as to the ultimate fire resist- 

 ance of the brick in respect to time, was prevented by the 

 fusing of the supporting and underlying brick in the 

 bridge wall, there having been insufficient material fur- 

 nished out of which to build the bridge wall entire. 



During the year 1920, similar tests although not car- 

 ried to the point of actual pottery manufacture, were 

 made by the Coosa County Mining Company on the asso- 

 ciated mica-kaolins from their Mica Hill mine near Dada- 

 ville, Tallapoosa county, representing an entirely differ- 

 ent district, locality, and environment. 



The physical characteristics however of the two clays 

 were very similar, and their composition as shown hy 



the following analysis differs very slightly. 



- 



THE BATTLE LABORATORY. 



Montgomery, Alabama, Nov. 10, 1920. 

 No. 70994. Analysis of Sample Kaolin. 



Received from the Coosa Co. Mica Co., Wetumpka, Ala. 



Per Cent. 



Moisture ! 2.42 



Silica 45.62 



Oxide of Aluminum 38.26 



Combined water ... 13.24 



99.64 

 Note. A very pure Kaolin Clay. 



(Signed) THE BATTLE LABORATORY. 



In co-operation with the Alabama Geological Survey 

 further tests of this clay were made by Dr. H. Ries of 

 Ithaca, New York, at the instance of Dr. Eugene A. 

 Smith, State geologist. 



Quoting from Dr. Reis report to Dr. Smith he says : 

 "The clay sample submitted is evidently a white resi- 

 dual clay, in fact it is one of the whitest I have ever seen. 



