118 



CHEMICAL MANUEES. 



encased on one side in plain discs a, on the other on crowns a. The 

 first (inside), third and fifth cages form an aggregate of a single 

 piece, screwed with the boss of the disc on to a driving shaft. In 

 the same way the second, fourth and the sixth cages form an ag- 

 gregate mounted on the other shaft. The machine is driven from 

 the same shaft by means of two belts, one of which is straight and 



:l 





■L.j/!n/m/im.,i,Wli 



Fig. 29. — Carr's Disintegrator. 



the other crossed, so that the cages formed by one of the elements 

 of the drum fit into the annular spaces of the other and turn in a 

 contrary direction. The machine is generally enclosed in a tight 

 cover and surmounted by a hopper e, into which the material to be 

 pulverized is charged. These fall into the interior cage, and the 

 machine being in motion, they are projected by the centrifugal 

 force across the bars of the first cage into the second ; turning in an 



opposite direction from the second they 

 are projected in the same way into the 

 third which turns in the same direction 

 as the first, then into the fourth, and so 

 on. Finally, they are projected on the 

 outside on all the points of the periphery 

 through the bars. The operation does 

 not last a second. This rapid grinding 

 is not astonishing if the great number 

 of shocks to which the matter is sub- 

 jected be considered ; the power of 

 these shocks consists in the sum of the 

 speed of the substance in one direction 

 and of the bars of the cage in the other. 

 The substance issuing from the crusher falls into a side channel 

 hollowed out of the foundation of the machine, from there it 



o o 



Fig. 30. — Carr's Disintegra- 

 tor. Plan of the Cylindrical 

 Cages. 



