284 



CORN 



Duvel Moisture Test. 



BROWX-DUVEL MOISTURE 

 TESTER 



Sectional view showing the various 



parts properly connected for use. 



Heating chamber and condensing 



tank in position. 



The moisture test is very simple, but re- 

 quires painstaking accuracy. The appara- 

 tus consists essentially of a one-liter glass 

 flask arranged above a gas burner; a 

 thermometer which extends through the 

 rubber stopper in the mouth of the flask 

 (A), a glass tube also fitted through the 

 rubber stopper into the flask and running 

 through a metal condensing tank filled 

 with cold water into a 25 c. c. glass gradu- 

 ate (B). As a rule this apparatus con- 

 sists of a series of such flasks, burners, 

 thermometers and graduates, so that a 

 number of samples may be tested at the 

 same time. 



Into each distillation flask place first 

 150 c. c. (cubic centimeters) o£ engine 

 oil, which must have a high flash point. 

 A\'eigh accurately 100 grams of thorough- 

 ly mixed grain and place in the flask, sub- 

 merging it in the oil, insert the thermom- 

 eter through the rubber stopper so that 

 only the mercury bulb is immersed in the 

 oil, then connect the flask with the con- 

 denser and 25 c. c. graduate by means of 

 the glass tube which fits into the rubber 

 stopper. Be sure that the graduate is dry 

 inside. 



When the flasks are filled apply the heat until a temperature of 

 190 degrees centigrade is reached (for corn). Heat gradually so that 

 the required temperature is reached in approximately 20 minutes. 

 Then remove the flame and allow the temperature to recede 15 degrees 

 (or to 175 degrees). This \\'ill require about ten minutes more. 



Since 100 grams of grain is used in the test and one cubic centi- 

 meter is equivalent to one gram, the percentage of moisture in the 



