THE CONTROL OF THE FACTORY. 



a direct weighing of cane, it was once customary to receive the megass in 

 trucks passing over a weigh bridge ; the economies to be obtained by the 

 adoption of automatic firing led to the abandonment of this scheme. The best 

 means of weighing the megass is afforded, the writer believes, by the use of a 

 travelling band weigher, such as the Blake-Dennison. Actually in practice it 

 is general to obtain the weight of the megass from the ratio of the fibre in 

 cane and in megass. 



Added Water. Any of the appliances used for obtaining the 

 weight of the juice are of course equally applicable to obtain the weight of 

 the added water ; actually, however, the only direct measurement the writer 

 has ever seen used is by the employment of two tanks, one filling while the 

 other empties. The weight of water added is usually deduced from the 



equation 



Canes + water = mixed juice + megass, 



the weight of megass being obtained from the ratio of the fibre in cane to 

 fibre in megass. 



In a subsequent section it is shown how the weight of added water can be 

 calculated from analytical data and one direct -measurement of any one of the 

 above quantities. 



It must be carefully borne in mind that the water usually calculated as 

 present in the juice does not represent the whole amount added since a part of 

 this goes away in the megass and that the dilution represents only the dilution 

 on the amount of juice expressed. 



Weight of Press Cake. The press cake can be easily weighed in 

 the trucks in which it is received for removal ; if this is not possible a figure 

 of reasonable accuracy can be obtained by determining the average weight of 

 one press, and by keeping a tally of the number of presses filled. 



Weigfllt of Syrup. The weight of syrup can be obtained from a 

 record of the number of tanks filled combined with determinations of its 

 density ; to be of value this record must be made with the same care as is 

 afforded the measurement of the juice. 



Weight of Massecuites. It is only in exceptional cases that 

 the factory arrangements are such that the massecuites can be weighed, and 

 in general their weight is deduced from volume measurements in combination 

 with observations of their density. 



Weight of Waste Molasses. The weight of waste molasses is 

 usually obtained from observations of the volume and density of the low 

 massecuites combined with observations of the weight of sugar obtained on 

 purging. In some Hawaiian factories it is the practice now to weigh all the 

 waste molasses on beam scales before they are finally discharged. 



497 



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