THE EXTRACTION OF THE JUICE BY MILLS 



187 



When all these results are combined into their simplest form, that is. 

 to say, when the cane is expressed as consisting of a soft part (pith) and a 

 hard part (rind and nodes), the average results appear as below : 



100-00 

 *3*7 

 17-1 

 14 '8 



23-0 



33 * 



12-3 



8*5 



ABSOLUTE JUICE. 



Weight per 100 cane 



Solids per cent. 



Sugar per cent. 



Purity per cent. 

 PITH JUICE. 



Weight per TOO cane 



Solids per cent. 



Sugar per cent. 



Purity per cent. 

 RIND AND NODE JUICE. 



Weight per 100 cane 



Solids per cent. 



Sugar per cent. 



Purity per cent. 



86-3. 

 19-8. 

 17- 1 

 86-4 



70-8 



20 '2 



18-5 



90-3; 



15' 



18- 



12' 



12000 



j ' 1,000 



WHOLE CANE. 



Weight per 100 cane 



Fibre per cent. 



Solids per cent. ... 



Sugar per cent. .... 

 PITH. 



Weight per 100 cane 



Fibre per cent. 



Solids per cent. ... 



Sugar per cent. 

 RIND AND NODES. 



Weight per 100 cane 



Fibre per cent. ... 



Solids per cent 



Sugar per cent. 



In the analyses quoted 

 above the solids are "refrac- 

 tive solids," the sugar is de- 

 termined by single polariza- 

 tion, and the purity is re- 

 fractive polarization purity. 

 The fibre is determined by 

 difference. 



These analyses, it must 

 be remembered, are quali- 

 fied by the personal equation 

 of the operator ; and abso- 

 lute separation into rind 

 and "pith " cannot be made, 

 since these divisions pass 

 gradually into each other. 

 The writer has also observed 

 as a general rule that a high 

 percentage of fibre is associ- 

 ated with a high proportion 

 of rind tissue. 



The Behaviour of Cane 

 Fibre on Compression. In 



the following section fibre is 

 used in its broadest sense 

 and refers to the insoluble 

 matter of the cane ; that is 

 to say to an indefinite mix- 

 ture of rind tissue and pith 

 tissue. As the process of 

 the extraction of juice is largely [one of exposing cane fibre to great 

 pressure, the writer made an experimental study 2 of the behaviour 

 under pressure of cane fibre, represented by chopped cane and by bagasse. 

 The experiments were made in the following manner : The material 

 was placed in a cylindrical iron pot with a perforated bottom. By 

 means of a tightly fitting plunger known pressures were applied to the 



comec */ng prc* sunev? /6s/>er SfJ/7.& 



