28 
BULLETIN 1375, U. S. DEPARTMENT OF AGRICULTURE 
(7) Trial tests should be repeated 'until the heating time for all 
compartments does not vary more than half a minute from 20 min- 
utes; that is, the heating time should not be less than 19y 2 minutes 
or more than 20y 2 minutes to raise the temperature of the 450 cubic 
centimeters of oil to 175° C. 
VARIATIONS IN HEATING TIME AND MOISTURE-TEST RESULT 
CAUSED BY POSITION AND CONDITION OF WIRE GAUZE 
The wire gauze used in the bottom of the tester compartment will 
cause variations in heating time, with consequent errors in the 
moisture test result when the gauzes are burned off, cracked, have 
GAUZES 
IN GOOD 
CONDITION 
AND 
CORRECTLY 
PLACED 
(Chech) 
GAUZES 
IN GOOD 
CONDITION 
BUT 
INCORRECTLY 
PLACED 
GAUZES 
WITH HOLES 
BURNED IN 
THEM AND 
OTHERWISE 
DAMAGED 
IS minutes 
1 1.9% moisture 
Correct Heating Time 
And 
Moisture Test 
ERROR 
RANGE 
^S^^^^^^^ 
0.8% 
) ;».« 
VARIATION 
- IV* MIN. 
ERROR 
+ 02 ~" 
-¥'/,\''l6k "minutes "'///////\ 
RANGE 
i^^ 
0.6% 
} \,3.7% 
\'////\ Av heat ma 
*"'" ' time 
Minimum 
moisture 
Results of 6 tests for each type of Gauzes using the same sample of wheat 
Average 
moisture 
I I Maximum 
' * moisture 
Fig. 21. — Effect of the condition and position of the wire gauze in the moisture 
tester on the moisture test result 
holes burned in the asbestos center or in the ga'uze itself, or when 
they are incorrectly placed. 
Data given in Table 5 and illustrated in Figure 21 show that the 
use of wire gauzes that are burned off, cracked, have holes burned 
in them, or are incorrectly placed will cause a faster heating time 
than the standard time, and an increase in the moisture test result 
OA T er the correct result. The results also sIioav that the use of dam- 
aged or incorrectly placed gauzes will cause an appreciably wider 
range between results of tests than when gauzes are in good condi- 
tion and in correct position. 
