2 BULLETIN 48, U. S. DEPARFMENT OF AGRICULTURE. 
under varying weather conditions. A standard scale test car was 
also attached to each shipment, and all scales were carefully tested 
prior to weighing the cars. Each shipment was accompanied by a 
representative of the United States Department of Agriculture, for 
the purpose of making weighings en route at certain division points 
and of keeping a complete record of the changes in the temperature 
of the corn. The temperature records were taken by means of elec- 
trical resistance thermometers, which were placed in the corn at the 
time of loading, as shown in figure 1. Im all of the shipments, with 
the exception of the first, two cars were loaded from each lot of corn. 
In the second, third, and fourth shipments one car from each lot of 
7. ak ce =I 
| Wee OF GRAIN 
a Ee op « ef é . ae eye fF ae ae 7, a _ a : s > ry 
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Fic. i.—Sectional view through the center of a freight car, showing the position of the 
six electrical resistance thermometers in the stored corn. 
corn was shipped from Baltimore to Chicage and return, while the 
duplicate cars of corn from each lot, together with an empty box car 
of the same type, were held on the track in the yards at Baltimore. 
FIRST EXPERIMENT, APRIL 14 TG MAY 11, 1938. 
CORN LOADED INTO CARS. 
On April 14, 1910, five cars were loaded with shelled corn from 
the Locust Point elevators of the Baltimore & Ohio Railroad Co., 
Baltimore, Md. The amount of corn contained in each car varied 
from 65,920 to 67,160 pounds, with an average of 66,832 pounds, or 
slightly more than 1,193 bushels. The different jots of corn used in 
this experiment were taken from the regular stock in the elevators 
and were selected primarily with the view to having corn with a 
relatively wide range in moisture content. Before loading, each lot 
was thoroughly mixed by handling in the elevator, so that the quality 
and condition of the corn would be uniform throughout the car. At 
the time of loading, each car was equipped with six electrical resist- 
ance thermometers, as shown in figure 1. These thermometers were 
