8 
BULLETIN 1375, U. S. DEPARTMENT OF AGRICULTURE 
or deficiency in the capacity of the graduates should be not greater 
than 0.05 cubic centimeter at the points 5, 10, 15, 20, and 25 cubic 
centimeters. The base of the graduates should be ground to rest 
evenly on a flat surface at right angles to the axis of the diameter. 
The graduates should be cylindrical in form, 7% inches high and 
eleven-sixteenths inch inside di- 
ameter, as shown in Figure 5. 
They should be of good quality 
glass, thoroughly annealed, clear, 
transparent, of uniform but not 
excessive thickness, and free from 
bubbles and streaks. 
In using the graduates where 
100 grams of the material being 
tested are used for the test, the 
number of cubic centimeters of 
water which collects in the gradu- 
ate corresponds to the percentage 
of moisture originally contained 
in the sample. 
In making the moisture deter- 
mination, a small quantity of oil — 
usually less than 0.5 cubic centi- 
meter — is carried over into the 
measuring cylinder or graduate 
and collects on the surface of the 
water, so that the moisture read- 
ings should be made at the bottom 
of the meniscus between the oil 
and the water. Should the oil 
and the water not separate read- 
ily, the graduated cylinder should 
be whirled by rolling quickly be- 
tween the two hands. 
SPECIAL GRADUATE 
In making moisture tests of oats 
it is necessary, on account of the 
bulkiness of the sample, to use 
only half the quantity of sample 
ordinarily used for other grains, 
so that a special graduate of 
smaller capacity is necessary. In 
using the special graduates in 
connection Avith tests in which 
only 50 grams of the material to 
be tested are used, the number of 
cubic centimeters of water which 
Fig. 6.- — Special moisture-testing gradu- 
ate. 1(5 per cent capacity, for use in 
testing moisture content of oats and 
other lightweight material 
collects in the graduates corresponds to only one-half of the moisture 
contained in a full-sized sample of 100 grams, but the graduates are 
so calibrated that the results are read in direct percentages. All the 
requirements noted for the manufacture of the regular 25 cubic centi- 
meter graduate obtain for this one also, except that the dimensions 
