THE BROWN-Dt'VEL MOISTUEE TESTER 7 
All graduation marks should be perpendicular to the axis and par- 
allel to the base and to each other. The graduation marks should 
be clear and distinct and uniform in character and should be etched 
or engraved and should not exceed 0.38 millimeter in width. Blown 
1 "ft 
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(7.0 m.m.) 
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33-13 
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/£ 
Pig. 4. — Standard thermometer with 
the proper shape and dimen- 
sions for use in the Brown-Duvel 
moisture tester 
Fig. 5. — Standard moisture-test- 
ing graduate. 25 cubic centi- 
meters capacity 
or pressed graduation marks should not be used. The clear inter- 
val between graduation marks should be not less than 1 millimeter. 
The value of the main graduation marks should be plainly desig- 
nated, as shown in Figure 5. The tolerance to be allowed in excess 
