CANE SUGAR. 



Solving this equation, a is found to be -9125, i.e., the weight of mixed 

 juice is 91-25 per cent, of the weight of the cane, and if the actually observed 

 records do not agree with this determination then an error is indicated as being 

 present. 



In the above argument B c is the quantity represent- 

 ing the total solids in the whole juice in the cane ; it is 

 not usual to determine this quantity directly and in some 

 factories it is even customary to take the Brix of the 

 first expressed juice as representing this quantity. 



The factor connecting the Brix of the first expressed 

 juice and the Brix of the whole or absolute juice of the 

 cane is capable of ready determination ; the equation 

 obtained above may also be used to obtain the relation 

 between the Brix of the first expressed juice and the 

 absolute juice, the actually recorded weights of cane and 

 juice being employed; the factors found from analysis 

 and from the recorded measurements should agree ; a 

 difference indicates an error. 



With canes of 12 per cent, fibre and first expressed 

 juice equal in weight of 60 per cent, of the cane, the 

 writer has found that the following relation holds : 



(Brix of first expressed juice) -97 = Brix of absolute juice. 



FIG. 271. 



Automatic Record of Density. 



Langen's Apparatus for recording the density 

 of the juice is shown in Fig. 271 j the juice 

 enters a containing vessel /and overflowing 

 at d passes away at h ; a constant level of 

 juice is thus maintained ; inside the narrow 

 central portion of the vessel is a tube s, to the 

 lower end of which is attached a rubber ball g ; 

 the upper portion of this tube is funnel- 

 shaped ; this inner tube is filled with water ; 

 the height of the water is dependent on the 

 pressure on the rubber ball, the pressure 

 being in turn dependent on the density of the 

 juice. The level of the water is recorded by 

 means of the float 0, which carries a pencil a 

 pressing against the cylinder b, which revolves 

 by a clockwork arrangement every 24 hours ; 

 the lower portion of the inner tube is formed into a spiral at 

 the juice and water being of the same temperature. 



D 



FIG. 272. 



so as to ensure 



500 



