STOKING OF SUPERPHOSPHATE. 



119 



collects in the receiving vessel of an elevator, which removes it. 

 The size of the drums, number of revolutions a minute, the 

 force and the number of bars, vary according to the nature and 

 the quantity of the material to be treated and according to the 

 fineness to be imparted. A product, consisting of granules of 

 no matter what size, can be obtained by turning the drums at a 

 greater or less speed and using a suitable distance between the bars. 

 The experience of the constructor is here the best guide. Carr's 

 disintegrator is one of those which utilizes, to the best advantage, 

 the energy which is transmitted to it, which explains its extraordin- 



FiG. 31. — Carr's Disintegrator or Toothed Crusher, C. Sieve. 



G. H. Transmission Shafting. 



F. Elevator. 



ary high output compared with other disintegrators, of whatever 

 nature. It is used, not only for crushing superphosphates, but also 

 for degelatinized bones. It also renders good service in making com- 

 pound manures provided that the ingredients possess the same or 

 but slightly different densities. 



Cylindrical Crusher Fitted ivith Teeth.— This crusher consists 

 essentially of a cast-steel foundation, on which are mounted two 

 rolls, one of which is smooth, and the other lined with steel teeth. 

 The first of these rolls has a diameter of 350 mm. (say about 14 

 in.), and makes 100 revolutions a minute. The second has a 



