THE SEPARATION OF THE CRYSTALS. 



The transport of the sugar from the centrifugals to the elevator is effected 

 by means of a belt, a * grasshopper? or a spiral conveyor. Belt conveyors, 

 which are but little used, consist merely of endless belts running on 

 pulleys. The grasshopper conveyor, Fig. 21/j., is a suspended trough supported 



FIG. 214. 



on flexible inclined blades ; a to and fro motion is transmitted to the trough 

 by means of a belt, pulley and connecting rod, whereby the sugar is jerked 

 forward. The spiral conveyor, Fig. 215, consists of a trough in which rotates 

 a steel spiral, the sugar being earned forward by the action of this screw. Of 

 these systems, the writer prefers the grasshopper, as in the screw conveyors a 

 certain loss occurs, due to crushing of the grains from the action of the 

 screw. 



Where the sugar is bagged directly from the basket, the bags are carried 

 to the storage room on an endless slat conveyor. 



Storage of Sugars. It is often necessary to store sugars for long 

 periods, whereby deterioration sometimes occurs; the evidence connecting 

 deterioration with bacterial action is collated in Chapter XXVI. It may be said 

 that two postulates are necessary for deterioration, sufficient moisture and 

 presence of bacteria. Deerr and Norris 2 found that with 1 per cent, of water 



FIG. 215. 



infected sugars did not suffer deterioration ; a 'factor oj safety ' due to the 

 Colonial Sugar Refining Co. of Australia, and which has become widely known, 

 is that the water should not be more than half the non-sugar, or when 



,-TT; - 1 r- < '333, the sugar will not deteriorate. 

 100 polarization 



383 



