THE SEPARATION OF THE CRYSTALS 



411 



carries the driving pulley D.P. and the basket B., and is supported by a shoulder 

 on the washers. The outer casing or curb, which serves to collect the 

 molasses, is shown at O.C, the molasses flo\s-ing away by a spout. The 

 central valve, D.V., sliding on spindle, also forms a part of the patent claim. 

 In the Hepworth machine (patent 3375 of 1871 ; U.S. patent 82314, 1868) 

 the whole machine was suspended from a baU and socket joint. The spindle 



which carried the basket was solid and rotated in fixed bearings, which 

 were attached to the curb or outer casing, so that basket and ciu-b always 

 remained concentric. Oscillations of the rotating basket were hence trans- 

 mitted to the suspended outer casing, and the whole machine was free to 

 swing. The oscillations were restrained by attaching the outer casing to 

 fixed pins by means of rubber bands. This particular type of machine has 



