24 BULLETIN 867, U. S. DEPARTMENT OF AGRICULTURE. 
thereon a layer of hulls, and then piling the pomace on this. Such 
an arrangement in conjunction with the introduction of the solvent 
from beiow insures the movement. upward rather than downward 
of the albuminous products and other sedimentation and greatly 
minimizes the tendency to pack. Such an extractor may hold a 
charge of 10 tons with a period of operation of possibly 20 hours 
from the commencement of loading of one batch to that of the — 
following batch. 
The advantage of the stationary type of extractor is a 
of installation and absence of more or less complicated machinery. 
O/L FINISHING SOLVENT RECOVERY A 
ST7LL STILL 
Fig. 13.—Sections of extraction plant. 
The rotary extractor is finding increasing favor because of its ease 
of operation, efficiency of performance, and low labor charge. The 
central unit of the rotary extractor plant (fig. 13) consists essentially 
of a closed cylindrical tank, mounted horizontally upon riding rings 
and provided with a series of manholes along one side for the intro- 
duction and discharge of material. This tank is mounted upon 
trunnion rollers and is rotated by means of a girt gear which is 
attached to one end of the shell and driven by a set of geared 
countershafts. A false bottom covered with burlap extends along 
the entire length of the tank, thus leaving a clear flow for the 
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