CANE SUGAR. 



considerable time ; a fully accurate analysis of a carefully taken week's sample 

 is of much more value than six inaccurate daily analyses. 



Massecuites received in tanks for crystallization in motion are best 

 sampled after they have been stirred for a short time. 



Sampling of Press Cake. A hollow cylinder with bevelled cutting edge 

 may conveniently be used to bore out samples of press cake; it must be 

 remembered that the sugar content of press cakes varies largely with position. 



Sampling of Molasses. Considerable variations in the composition of 

 molasses as they leave the baskets may be observed, and it is better to take 

 the sample from the tanks in which they are received. In case the molasses 

 are run to waste directly, they should be systematically sampled at frequent 

 intervals. 



Sampling of Sugars. This is generally done by instructing the foreman 

 at the sugar filling station to throw a pinch of sugar from each bag filled into 

 a receptacle ; the writer prefers to take the sample from a large number of 

 bags from each consignment that leaves the factory. It must be specially 

 remembered that sugars lose or gain in weight very rapidly, and care should 

 be taken that the sample analysed, in so far as regards its percentage of 

 moisture, corresponds with the main body of the sugars from which it was 

 taken. 



Control of the Milling Plant. The most generally used figure, 

 as a criterion of the power exerted by the mills, is the water percentage of the 

 megass ; that this is not an accurate basis is shown by the following example : 



Let a megass be of composition : fibre 40 per cent., juice 60 per cent., 

 the juice being of density 1'065 and containing 16'6 per cent, solids and 83*4 per 

 cent, water. The water content of the megass is then 50 per cent. Now suppose 

 for this juice an equal volume of juice is substituted of density Iv040 and 

 containing 10-5 per cent, solids and 89*5 per cent, water ; the crushing is 

 evidently equally good in both cases, but now in the second case the weight of 

 the juice is reduced from 60 to 58-6 and the weight of water increased to 52*45, 

 which calculated on the reduced weight of megass, 98-6 of the first weight, 

 gives a water content of 53-2 per cent. ; at the same time the fibre content 

 varies and for the example quoted is increased from 40 per cent, to 40-5 per 

 cent., a much smaller variation, so that the fibre content of a megass forms a 

 much more accurate basis of comparison. A true basis of comparison is given 



by the expression 



Weight of juice in unit weight of megass 



Weight of fibre in unit weight of megass X density of juice 

 which expresses the volume of juice in megass per unit weight of fibre in the 

 megass. 



A control or oversight of the efficiency of the added water can be obtained 

 by the use of the following methods 5 : 



504 



