CANE SUGAR. 



The extraction can also be obtained from analytical data only without 



any weighings, as under : 



Per cent. 



Sucrose per cent, in cane (from analysis) , . . . 12-81 



Sucrose per cent, in megass 4-0 



Fibre per cent, in cane H*0 



Fibre per cent, in megass 44-0 



Then megass per 100 cane = 100 X =25'00 



25 X 4 

 Sucrose in megass per 100 cane = 1QQ 1-00 



Sucrose in juice per 100 cane = 12*81 I'OO 11-81 



Extraction = 



11-81 X 100 



12~ 7 81 = 92<19 P er cent 

 Then if the weight of cane is known the sugar entering the boiling house 

 is readily calculated. 



Sampling 1 Juices. Where the juices are received in tanks, no better 

 scheme can be devised than to take a fixed quantity from each tank or if the 

 tanks are of unequal size a quantity proportional to the volume of each ; the 

 samples are stored in a large bottle in which has been placed an antiseptic ; 

 the preservatives most used are corrosive sublimate, one part to 5000 or a 40 

 per cent, solution of formaldehyde (formalin) one part to 2000. Allowance is 

 made for the corrosive sublimate in determining the density of the juice. These 

 preservatives will keep the juices unchanged for twelve hours but nevertheless 

 the containers used for sampling should be kept scrupulously clean. 



Where the juice to be sampled is not measured, a continuous sampler 

 must be arranged. 



FIG. 273. 



Such a one is shown in Fig. 273 ; a is the main juice pipe into which is 

 fitted a short piece of iron or copper pipe, J, of half -inch internal diameter ; a 

 perforated cork carrying the bent piece of glass tubing c emerges from the end 

 of the pipe b and is continued to the bottom of the bottle d ; it is preferable to 

 make this pipe in two portions connected by a piece of indiarubber tubing ; 



502 



