CRUSHING AND PULVERIZING MACHINERY. 



447 



cent of it would pass a 100-mesh sieve and 77.7 per cent passed a 200- 

 mesh. 



Class 7. Ball Grinders. 



The mills of Class 7 include all those in which the raw material 

 is ground by flint, iron, or steel balls rolling freely in a horizontal or 



NOTE: 



A'sq. holes around anchor-bolts to be left open 

 'until mill is adjusted on foundation, 



Scale of Feed ^ 

 123458 7 8 9 10 11 12 13 



FIG. 97. Foundation plan, Lindhard kominuter, No. 66. 



slightly inclined revolving cylinder. Three fairly distinct types are 

 included under this definition, examples of which types are described 

 below under the respective headings of kominuters, ball mills, and tube 

 mills. Of these three types, the kominuter is represented by only 

 one machine, the Lindhard kominuter; but ball and tube mills are 

 made by many manufacturers, the different makes differing slightly 

 in design but often greatly in value. 





