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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 below insures the movement upward rather than downwara 

 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 simplicity 

 of installation and absence of more or less complicated machinery. 



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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 



