10 



BULLETIN 330, U. S. DEPARTMENT OF AGRICULTURE. 



by the elimination of the brown exterior bran coats. In some mills 

 the rice is passed through a second set of hullers. 



Bran reel. — The bran reel receives the product from the hullers 

 and separates the rice from the powdery bran. This reel is com- 

 posed of a large octagonal framework covered with fine wire screen, 

 the square meshes of which are 14 per linear inch. The reel is set 

 on a slight incline and its slow revolving motion takes the rice, which 

 enters at the higher end, through its length of 9 feet in about 5 



minutes. As the reel 

 revolves, the rice con- 

 stantly falls from side 

 to side and forces the 

 bran through the wire 

 covering. 



Pearling cone. — The 

 pearling cone, which 

 has recently been in- 

 troduced in many mills 

 to supplement the work 

 of the hullers, is essen- 

 tially the same ma- 

 chine that is used in 

 the pearling of barley. 

 The principal working 

 part of the machine is 

 a frustrum of a cone 

 covered with a compo- 

 sition stone; this is 

 surrounded by a sieve 

 mantle composed of 

 close - meshed heavy 

 iron wire. The rice is 

 fed from above be- 

 tween the stone and 

 the sieve and is thor- 

 oughly rubbed before 

 passing out at the bottom. The severity of the scouring is regu- 

 lated by raising or lowering the stone, thus decreasing or increasing 

 its distance from the wire screen. The best milling practice now 

 approves the use of the pearling cone, because with its use the grain 

 may be more gradually scoured than where the hullers alone are 

 used and the breakage can also be kept lower. The loosely adher- 

 ing bran resulting from the action of the pearling cone is removed 

 from the rice in a bran reel. This bran is generally combined with 



Fig. 5. — A typical rice huller, showing its exterior construe 

 tion, belting, hopper, feed, milled rice, etc. 



