CENTRIFUGAL DRAINING MACHINE. ra 
ural drainage, whenever exhibited, may be readily over- 
come. ‘The unequaled celerity with which it does its work 
will enable the Northern sugar grower to achieve a result 
which heretofore could not be secured even in working up 
the comparatively pure sap of the maple, and which is now 
attained only in Southern sugar countries, namely, the pro- 
duction of perfectly dry, crystallized sugar in the evening, 
from cane which in the morning of the same day was 
standing in the field ! 
The essential parts of the centrifugal drainer are a cyl- 
indrical vessel or metallic drum, with a tight bottom, and 
closed at the tup by a movable cap, the cylinder being fixed 
in an upright position upon a frame, and within it a smaller 
cylinder of wire gauze, or sheet metal pierced with small 
holes, supported upon a vertical shaft, which is made to re- 
volve at a high speed, the motive power being communi- 
cated by a belt. 
The mass of sugar to be drained must be warmed to 
about blood heat, and placed within the inner cylinder, 
which is then made to revolve. The half fluid mass becomes 
distributed over the inner face of the cylinder, and the ve- 
locity is rapidly increased. The sugar is retained within 
the revolving screen, but the molasses is thrown out by cen- 
trifugal force, and caught in the outer case, from which it 
is conveyed away by a spout. 
In the course of two or three minutes the motion may be 
checked, and the inner cylinder may then be lifted up, the 
dry sugar turned out of it, another charge inserted, and 
the process resumed. 
