THE SEPARATION OF THE CRYSTALS. 



to the driving pulley DP. The perforated basket is shown at B, and the outer 

 casing at 00 ; and sugar is discharged through a circular aperture at the 

 bottom of the basket, kept closed when necessary by the valve DV, which 

 slides up and down the outer spindle ; the bottom part of the outer spindle 

 forms an oil bath. The elastic buffers are an essential feature of this type of 

 centrifugal. The massecuite will from time to time assume different centres 



267 



FIG. 204. 



of gravity ; instead of attempting to restrain the machine in a fixed position 

 this system allows a certain freedom of movement. 



A solid spindle has in recent years been generally substituted for the 

 hollow spindle, and after several failures ball bearings have been successfully 

 adapted to this machine ; in Fig. 20!j. is shown the upper part of a belt-driven 

 machine embodying these improvements. 



375 



