UNITED STATES DEPARTMENT OF AGRICULTURE 
DEPARTMENT BULLETIN No. 1375 
Washington, D. C. 
February, 1926 
THE BROWN -DUVEL MOISTURE TESTER 
AND HOW TO OPERATE IT 
D. A. COLEMAN and E. G. BOERNER, Grain Investigations, Grain Division 
Bureau of Agricultural Economics 
CONTENTS 
Page 
Description of the Apparatus „ 3 
Construction Specifications 4 
Description of Accessories 5 
Supply Pipes for Gas-Heated Moisture Testers 15 
How to Make a Moisture Test 17 
How to Test Different Substances 18 
Standardizing the Moisture Tester 20 
Variations in Heating Time Caused by Variations in Gas Pressure 23 
Variations in Heating Time and Moisture-Test Result Caused by Position and Condition 
of Wire Gauze 28 
Variations in Heating Time Caused by Variations in Thermometer Bulb Immersion . . 29 
Influence of Cooling Time on Moisture-Test Results ;..... 30 
Priming Tests 31 
Volume of Oil v. Moisture-Test Result 33 
Brown-Duvel Moisture Testers Equipped with Electric Heaters 33 
Tests with Alcohol and Gasoline Burners 39 
How to Choose Extinguishing Temperatures 39 
Drawing and Handling Samples 41 
Special Points for Consideration > . . . . . 42 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1926 
