12 
BULLETIX 330, U 
DEPARTMENT OE AGRICULTURE. 
been observed in use in the mills of the United States. In seme 
cases a second trumble without glucose and talc feeds supplements 
the work of the first, and it is generally conceded that the extra 
friction gives to the rice a brighter and more desirable luster. 
Table II shows the percentage of rice-coating material used in a 
large number of mills in Louisiana. Texas, and Arkansas. The fig- 
ures given were calculated by ascertaining the daily output of the 
mills and the corresponding gallons or pounds of coating materials 
actually being applied. The considerable variation in the quantities 
of the coating material used, as shown in the maximum and minimum 
columns of the table, is due to the difference in the quality of the 
various lots of rice and to the interpretation of trade demand by the 
mill management. The averages show that the Honduras and Japan 
types of rices receive about the same quantities of coating materials, 
which approximate two parts of glucose and one part of talc per 
thousand parts of rice. 
Table II. — Glucose and talc added to mined rice. 
Xumber 
of 
samples. 
Glucose (per cent). Talc (per cent). 
Type of rice. 
Average. 
Maxi- 
mum. 
Mini- 
mum. 
Ivera^e ' Maxi " Mini " 
average. , mum mU m. 
Honduras . 
Japan 
29 
S 
0.20 
.19 
0.46 
.26 
0.06 
.09 
0.07 0.30 0.02 
.09 .20 .05 
Grading machines. — From this stage to the ultimate bagging the 
problems met with pertain to the grading of the clean rice. How- 
ever, if the rice is damaged or very inferior because of the presence 
of red rice, it is often bagged ungraded and sold as " line " rice. The 
shaker frame, which was the earliest device used for grading rice, is 
simply a framework, mechanically operated, which supports a set of 
inclined flat metal screens. These screens are removable at will and 
are numbered according to the sizes of the round perforations in 
them. The unit of measure is a sixty-fourth of an inch : hence, a 
Xo. 8 screen has holes eight sixty-fourths of an inch in diameter. 
Shaker frames are still used in practically all mills, to aid in the 
grading work. In most cases a considerable proportion of the 
c * fancy head " grade is removed on the screens before the rice goes 
to the cockle cylinder. 
If the quality of the rice being milled is exceptionally good an 
extra fancy head grade is made, which consists of the largest and most 
nearly perfect grains of the lot. with only a small percentage of broken 
particles. This commercial grade, if of the Honduras type, consist- 
of that rice which does not pass through a Xo. 8^ screen on the shaker 
frame, and. if Japan, a Xo. 7-J screen. In passing the rice over the 
