THE MILLING OF EICE. 9 
rapidity of the feed. Four to six paddy machines are generally em- 
ployed in a mill of 600 barrels daily capacity. The structure and ar- 
rangement of two paddy machines are shown in figure 4. 
Table I shows the efficiency of the paddy machine in separating 
the unhulled from the hulled rice. In studying this table, it must be 
remembered that about 80 per cent of the rice passes out at the lower 
or clean-rice side of the machine. 
Table I. — Average results of analyses of four samples of the Honduras type of 
rice secured from the feed boxes of paddy machines and of corresponding 
samples from the troughs at the clean-rice and rough-rice sides. 
Product. 
Rice (per cent) from— 
Feed box. 
Clean side. 
Rough side. 
81.85 
17.25 
.90 
98.98 
1.02 
16.56 
77.68 
Hulls 
5.76 
The rice from the rough side of the paddy machines is returned 
to a pair of small stones which are set close together, where the short 
kernels are hulled and then combined with the rice from the first 
stones. The rice from the clean side is now practically free from 
hulls, but the grains retain the thin brown bran layer as well as the 
eye, or germ, intact. 
Hullers. — The name "huller," given to the next machine in the 
milling process, is very misleading, because in reality this machine is 
used for removing the bran layer from the grain which has been 
hulled by the stones and freed from rough rice by the paddy machine. 
The word " huller " is universally understood in this connection in 
the rice industry, and hereafter when the word appears in this bulle- 
tin it will designate the machine which receives the rice from the 
paddy machine and scours oif the outer bran layers. The name was 
probably inherited from the similar machine, the plantation huller 
already described, which removed hulls as well as bran. The modern 
huller is somewhat smaller but otherwise very similar to that already 
described, and six or seven machines are necessary in a 600-barrel 
mill. The grain from the clean-rice side of the paddy machine is 
conducted to the feed hopper of the huller and thence passes into 
the cavity of the machine. A part of the bran layer on the outside 
of the grain and most of the germ are removed, largely by scouring 
between the rough inside iron walls of the tapering cylinder and the 
grooved surface of the rapidly revolving core. Figure 5 shows the 
type of huller used in modern rice mills. In this machine the milling 
quality of the rice is put to a severe test and the grain much whitened 
10832°— Bull. 330—16 2 
