n6 



CHEMICAL FERTILIZERS 



in water. The hides are then soaked in a vat with lime or 

 sulphide of lime, for the purpose of removing hair. Owing 

 to the deep position of the hair bulb in the hides, some 



t Fio. 5. Disintegrator. 



A is the axle on which the moving parts revolve ; it is broadened out into 

 a flat plate, to enable the arms to be satisfactorily attached. 



D are the arms, which hammer the material to fragments. They are 

 hinged on to the axle (A) so as to permit of movement should any 

 unbreakable material be encountered. Normally, owing to the high 

 speed, the arms are flung, by centrifugal force, into the position shown. 



C is a corrugated roof, which helps in breaking the material flung against 

 it by the rapidly moving arms. The speed of revolution is such that the 

 peripheral velocity is about 3 miles per minute. Such a speed forces 

 the air outwards and prevents a back blow through the feed intake. 



S are the sieves, through which the material is forced by the current of 

 air engendered by the centrifugal force produced in the air by the 

 revolution of the arms. 



B is the box in which the dust falls. Owing to the high velocity of the 

 air currents induced, the box must be spacious to permit the deposi- 

 tion of the dust which, otherwise, would be carried away. 



The corrugated casing (C) should have at least one section hinged, 

 so that such an object as a horse-shoe, should it find access, could be 

 easily ejected without cessation of work. 



considerable degree of soaking is necessary before the hair 

 can be removed. After softening the hair is scraped off 

 with a knife. The lime and hair liquors produced in this 



