190 DETAILED REPORT ON ALABAMA CLAYS. 



18 per cent. The clay fused or became viscous at 2600' 

 F. The folio wiug is a composition of it : 



Analysis of Pressed Brick Clay, Oxford, Oalhoun Co. 



Silica 71.30 



Alumina 17.16 



Ferric oxide 1.94 



Lime .60 



Magnesia .43 



Alkalies 95 



Ignition 7.60 



99.98 

 Total fluxes 3.92 



This clay should make a good buff colored ware if 

 burned at a comparatively low temperature, but if burned 

 to vitrification the color would of course be much darker 

 as indicated by the test, and owing to the high shrinkage 

 in burning it would be necessary to conduct the latter 

 slowly and with care to prevent cracking of the clay.* 



(No. 110.) 



PRESSED BRICK CLAY. 

 SHIRLEY'S MILL, FAYETTE co. 



The clay from this locality is a very fine grained dense 

 one, but at the same time breaks up very easily. 



It took 33 per cent, of water to work it up, and the air 

 shrinkage of the bricklets was 6 per cent. 



Incipient fusion occurs at 2100 F. , 



Vitrification took place at 2200 F. and at this point, 

 the bricklet showed a total shrinkage of 16 per cent., and 

 a deep cream color. 



In the Deville furnace, at cone 27, the clay became 

 viscous. 



*These bricks are well known in Alabama, and deserve to be even more 

 generally usd than they are. E. A S. 



