THE BKOWN-DUVEL MOISTURE TESTER 
29 
Table 5. — Damaged or incorrectly placed wire gauzes cause errors in moisture 
test results in testing wheat 
[Wire gauzes that are damaged or incorrectly placed in the compartments of the moisture tester affect the 
heating time of tests and cause variations in moisture results] 
Condition of wire gauze 
Compartment No. 
Good and cor- 
rectly placed 
(check) 
Good, but flame 
striking edge of 
asbestos center 
Damaged (asbes- 
tos burned off and 
holes in gauze) 
Good and cor- 
rectly placed 
(check) 
Heating 
time 
Mois- 
ture 
Heating 
time 
Mois- 
ture 
Heating 
time 
Mois- 
ture 
Heating 
time 
Mois- 
ture 
1 
Minutes 
1834 
18 
1834 
1834 
1834 
18 
Per cent 
13.1 
13.3 
13.2 
13.4 
13.3 
13.1 
Minutes 
1734 
17 
1834 
1734 
1534 
1634 
Per cent 
13.3 
13.4 
13.6 
13.7 
12.9 
13.1 
Minutes 
1734 
16J4 
17H 
15 
15 
17 
Per cent 
13.3 
13.6 
13.5 
13.7 
13.1 
13.2 
Minutes 
18 
i«X 
18 
1834 
1834 
18 
Per cent 
13.0 
2 . 
13.2 
3 
13.2 
4 
13.3 
5 -. 
13.2 
6 
13.1 
1834 
34 
13.2 
0.3 
17 
2% 
-134 
13.3 
0.8 
+0.1 
1634 
2% 
13.4 
0.6 
+0.2 
1834 
34 
13.2 
0.3 
VARIATIONS IN HEATING TIME CAUSED BY VARIATIONS IN 
THERMOMETER-BULB IMMERSION 
Data in Table 6, illustrated in Figure 22, show that a deeper 
immersion than the correct depth of four-fifths immersion of the 
mercury bulb of the thermometer in the oil will cause a faster 
heating time and a lower percentage of moisture, and that a 
shallower depth of immersion will cause a slower heating time and 
a higher percentage of moisture. 
To insure correct moisture test results from the standpoint of this 
factor, the depth of immersion of the mercury bulb of each ther- 
mometer should be carefully noted and adjusted to the correct four- 
fifths immersion for each test. 
Table 6. — Variations in the depth of immersion in oil of the thermometer 
oulb will affect the heatimg time and cause errors in the moisture-test 
result 
Bulb immersion 
Average 
Maximum 
Minimum 
Range 
Average varia- 
tion from cor- 
rect (four-fifths) 
immersion 
Heat- 
ing 
time 
Mois- 
ture 
Heat- 
ing 
time 
Mois- 
ture 
Heat- 
ing 
time 
Mois- 
ture 
Heat- 
ing 
time 
Mois- 
ture 
Heat- 
ing 
time 
Mois- 
ture 
Bulb touching sur- 
surf ace . 
Min- 
utes 
19 
17H 
16M 
1634 
16 
Per 
cent 
10.5 
10.3 
10.2 
10.1 
10.0 
Min- 
utes 
1934 
17% 
17 
16% 
1634 
Per 
cent 
10.6 
10.4 
10.3 
10.2 
10.2 
Min- 
utes 
1834 
17 
1634 
16 
1534 
Per 
cent 
10.4 
10.3 
10.0 
10.0 
9.9 
Min- 
utes 
1 
/4 
34 
S A 
*A 
Per 
cent 
0.2 
0.1 
0.3 
0.2 
0.3 
Min- 
utes 
2% 
1 
Per 
cent 
+0.4 
Bulb one-fifth im- 
mersed 
+0.2 
Bulb one-half im- 
+0.1 
Bulb four-fifths im- 
Bulb totally im- 
mersed 
-34 
-0.1 
Correct positioi? 
