THE FILTRATION OF THE JUICE. 



Filtration through Wire Gauze. A very useful effect is 

 obtained by passing the juice through very fine wire gauze strainers ; for this 

 purpose a mesh of 100 strands per lineal inch is useful ; the writer has seen 

 high class consumption sugars made with the help of these strainers, with 

 suppression of the cleaning of the juice by boiling in open pans. 



Other Filtering Media. In addition to sand many other filtering 

 media have been proposed for use ; amongst these may be mentioned megass, 

 wood shavings, coke, chopped cork, pumice stone, slag wool, broken brick, 

 lignite, gravel ; of these the writer has seen fine wood shavings sold under the 

 trade name of Excelsior Packing used with great success. When these media 

 are used they are packed in vertical cylinders through which the juice is 

 allowed to gravitate ; the type of filter described under Sand Filter forms a 

 very convenient pattern. 



Composition of Press Cake. The composition of press cake is 

 shown in the following analyses due to Prinsen Geerligs : 



Double Double 



Carbonation Carbonation 



Second 

 Saturation. 



8-10 



50 

 4-20 



64 

 51 



85-01 



12 



82 



281 



