PREPARING THE MIXTURE FOR THE KILN. 421 



Plant No. 7. Marl and shale. 



Marl Shale 



1 stone separator 2 dry-pans 



1 pug-mill 



6 Bonnot tube mills, 16 feet 

 14 kilns 



Plant No. 8. Marl and clay. 



Marl Clay 



1 stone separator. 1 pug-mill 



1 pug-mill 

 3 tube mills 

 6 kilns 



Plant No. 9. Marl and clay. 



Marl Clay 



1 stone separator | 



2 wet-pans 

 4 tube mills 

 14 kilns 



Plant No. 10. Marl and clay. 



Marl Clay 



1 stone separator 1 rotary drier 



1 pug-mill 



4 tube mills 



6 kilns, 70 feet 



4 kilns, 60 feet 



Plant No. 11. Marl and shale. 



Marl Shale 



1 stone separator 1 rotary drier 

 1 Williams mill 



1 pug-mill 



2 tube mills 



9 kilns, 70 feet 



List of references on wet-process plants and methods. The following 

 papers, mostly descriptive of individual wet-process plants, contain 

 sufficiently detailed data on methods and machinery to be worth refer- 

 ring to as sources of further information. For convenience of reference, 

 the plants have been separately named, though at the cost of some 

 space. 



Orimsley, G. P. A new Portland-cement mill in the gas fields of Kansas 

 [lola]. Engineering and Mining Journal, Feb. 16, 1901. 



Lathbury, B. B. The Michigan Alkali Company's plant for manufacturing 

 Portland cement from caustic-soda waste. Engineering News, June 7, 

 1900. 



