THE BEOWX-DUVEL MOISTURE TESTKR 
29 
Table 5. — Damaged or incorrectly placed u-ire gauzes cause errors m moisture 
test results in testing irheat 
[Wire gauzes thct 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 
isy 2 
18 
mi 
isy 2 
18 
Per cent 
13.1 
13.3 
13.2 
13.4 
13.3 
13.1 
Minutes 
17H 
17 
ny 2 
16H 
Per cent 
13.3 
13.4 
13.6 
13.7 
12.9 
13.1 
Minutes 
17H 
Per cent 
13.3 
Minutes 
18 
18H 
18 
18M 
Per cent 
13.0 
2 
lf)i.> 13.6 
13.2 
3 
17*A 
15 
15 
17 
13.5 
13.7 
13.1 
13.2 
13.2 
4 
13.3 
5 .. __ 
13.2 
6 
18 13. 1 
18M 
13.2 
0.3 
17 
13.3 
0.8 
+0.1 
16H 13- 4 
18J4J 13. 2 
2% 
-1% 
0.6 
+0.2 
H 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 
bulb will affect the heating 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- 
surface... _____ _ 
Min- 
utes 
19 
1654 
mi 
16 
Per 
cent 
10.5 
10.3 
10.2 
10.1 
10.0 
Min- 
utes 
19J-. 
17H 
17 
1&% 
16M 
Per 
cent 
10.6 
10.4 
10.3 
10.2 
10.2 
Min- 
utes 
18H 
17 
16M 
16 
15H 
Per 
cent 
10.4 
10.3 
10.0 
10.0 
9.9 
Min- 
utes 
1 
% 
X 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- 
mersed _ _ 
+0.1 
Bulb four-fifths im- 
Bulb totally im- 
mersed. 
-X 
-0.1 
1 Correct positioD 
