MANUFACTURE OF SUPERPHOSPHATE. 



97 



minimum aperture determines the size of the crushed pieces."^ The 

 angle of the aperture of the jaws is easily adjusted by a very simple 



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regulating arrangement, according to the nature of the material to 

 be ground, and the degree of fineness required. The size of the 

 pieces may varv from 2 to 7 cm. in section, with a proportion of 



7 



