18 



BULLETIN 48, U. S. DEPARTMENT OF AGRICULTURE. 



Table IX. — Total amount of corn contained in each experiment, the average 

 moisture content of the corn at the beginning of the experiment, and the 

 average temperature of the corn immediately after loading and just prior to 



unloading. 



Experi- 

 ment 



Period covered by 

 experiment. 



In 



transit 

 from 

 Balti- 

 more to 

 Chicago 



and 

 return. 



Held on 

 track in 

 Balti- 

 more 

 yards. 



Moisture 

 content. 



Net corn 



in ears 



after 



loading. 



Shrinkage or loss 

 in weight. 



Average tem- 

 perature of corn 

 when — 



Pounds. 



Percent. 



Loaded. 



Un- 

 loaded. 



1. 



Apr. 14 to May 11. 



"1910. 

 Dec. 24, 1910, to Jan. 



20. 1911. 

 Mar. 2 to Mar. 29, 



1911. 

 Mav 11 to June 1-3, 



1911. 







Per cent. 

 1S.1 



17.9 

 17.9 

 18.3 

 18.3 

 16.7 

 16.7 



Pint ndy. 

 334,270 



258, 350 

 258, 200 

 257, 320 

 256, 540 

 261,710 

 257, 350 



3,360 



460 

 520 

 7S0 

 775 

 1,320 

 1,870 



1.01 



.18 

 .20 

 .30 

 .30 

 .50 

 .73 



°F. 

 55.0 



31.5 

 31.5 

 40.2 

 40.0 

 60.7 

 61.6 



°F. 

 85.2 



2 







30.0 



3 





4 cars. 



33.9 

 58.9 



4 





4 cars. 



58.3 

 90.6 







4 cars. 



99.6 



In all of the experiments, with the exception of the first, four cars 

 of corn differing in moisture content were shipped from Baltimore 

 to Chicago and return and four duplicate cars of the same kind of 

 corn were held on the track at Baltimore. 



It will be seen in Table IX and figure 6 that the average loss in 

 weight of the four cars of corn in transit from Baltimore to Chi- 

 cago and return in the second experiment, begun December 24, 1910, 

 was 0.18 of 1 per cent. The four duplicate cars held at Baltimore 

 showed an average shrinkage of 0.20 of 1 per cent. In figure 6 it 

 will be noticed that the average temperature of the corn in the eight 

 cars at the time of loading was 31.5° F. At the time of unloading 

 there was a difference in temperature between the corn in transit and 

 that on the track of 3.9 degrees, the temperature of the corn in 

 transit having decreased 1.5 degrees, while that of the corn on the 

 track had increased 2.4 degrees. This was caused by the lower air 

 temperatures in transit than at Baltimore, as shown in figure 3, 

 page 9. 



In the third experiment, begun March 2, 1911, the losses were the 

 same on the corn in transit as on the corn at Baltimore, being 0.3 

 of 1 per cent. In this experiment the average temperature of all" the 

 corn was 40° F., or 8^ degrees higher than the corn used in the 

 second experiment. The average increase in the temperature of the 

 corn in transit from the time of loading until it was unloaded was 18.7 

 degrees. The average increase in the temperature of the corn on the 

 track was IS. 3 degrees. By consulting figure 4 it will be seen that 

 the air temperature surrounding the corn in transit was practically 

 the same as the air temperature surrounding the corn at Baltimore. 

 In both cases the tendency was toward a higher air temperature; 

 consequently, the temperature of the corn in transit increased uni- 

 formly with the temperature of the corn at Baltimore. 



