812 



SCIENCE 



[N. S. Vol. XXVIII. No. 727 



temperature of grain while it is being warmed 

 or cooled im this way, which accounts for the 

 rattier wide departure of some of the points 

 from the mean curve. 



The Determination of the Moisture Con- 

 tent of Wheat at Different Temperatures. — 

 By combining the data shown in Figs. 1 and 2, 



moisture content and resistance, not only for 

 a single temperature, as in Fig. 1, but for 

 temperature intervals of 5 degrees from 80° 

 to 40° Fahr. In this chart, the moisture eon- 

 tents are plotted as ordinates and the 

 logarithms of the electrical resistances as 

 abscissas. To facilitate the use of the chart, 



>'?5E::r/,:y-7>7/vs:rE"— A^^r<^o/^A/A^ 



Fig. 2. Chart showing the Influence of Temperature upon the Electrical Resistance of Wheat. 



a 8 S J 



Fig. 3. Chart for Determining the Moisture Content of Wheat when the Mectrical Kesistance 

 and Temperature are known. Electrodes having the same dimensions as those described in the text 

 must be used in connection with this chart. 



we can construct a chart showing the moisture 

 content of the sample of wheat corresponding 

 to a given electrical resistance at any tem- 

 perature within the range of the experiments. 

 Such a chart is shown in Fig. 3. This chart 

 is similar to that of Fig. 1 except that we 

 have here lines showing the relation between 



resistances are written in the place of the 

 corresponding logarithms. To illustrate the 

 use of the chart, suppose that a resistance of 

 55 megohms was observed in a given sample 

 of wheat at a temperature of 75° F. Ee- 

 ferring to the chart, it will be seen that the 

 imaginary line corresponding to 55 megohms 



