THE MILLING OP RICE. 



17 



greatly subject to fracture by- a rapid change in temperature. Care 

 is used by the miller to shield, as far as possible, from currents of 

 cool air or from cold metal the rice which has become heated in the 

 brush or trumble. 



Twenty-five similar series of the Japan type of rice were secured 

 and analyzed in the same way, and the results are also shown in 

 Table IV. Breakage in milling rice of this type is seen to follow the 

 same lines as shown 

 for the Honduras 

 type, but less injury 

 occurs, on account of 

 the short, compact 

 shape of the grain. 



Figure 6 illustrates 

 the most important 

 data given in Table 

 IV. 



93 

 92 

 9 / 

 ■SO 

 83 



aa 



G7 

 G3 

 33 



a*? 

 33 



32 



a / 



BO 

 79 

 73 

 77 

 73 

 7-5 

 7<* 

 73 

 72 

 7 / 

 70 

 6 9 

 6 3 



e 7 

 e e 



63 

 6--? 



e 3 



6 2 



e / 

 e o 



3 9 



33 

 3 7 

 33 

 33 

 3<? 

 33 

 33 

 3 / 

 30 



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EFFECT OF WEIGHT PER 

 THOUSAND KERNELS. 



Nine series of sam- 

 ples of rice of the 

 Honduras type and 

 five series of the Ja- 

 pan type from modern 

 mills were analyzed 

 to show the effect of 

 the milling machines 

 on the weight of the 

 kernels. The whole 

 grains were picked 

 from a portion of 

 each sample and the 

 weight of 250 whole grains ascertained in every case. From this 

 the weight per 1,000 kernels was calculated. Attention is called to 

 the marked decrease in weight of the kernels caused by the action of 

 the-hullers and pearling cone. Some decrease in weight is caused by 

 the brush, and the slight increase after passage through the brewer's 

 reel is probably due to the removal at that point of a few of the 

 smallest whole grains. The addition of the glucose and talc coating 

 slightly increases the weight of the grains in the trumbles. A com- 



Fig. 6. — Diagram showing the decrease in the percentage of 

 whole grains in the Honduras and Japan types of rice 

 during the course of the milling process. 



