8 
BULLETIX 494, U. S. DEPAETMEN^T OF AGRICULTUEE. 
Frequent readings of the humidity in the rooms should be made, once 
every hour in the beginning, by means of the sling psychrometer. A 
record should be kept of these readings from the beginning to the 
end of the curing process. A convenient form for recording these 
data is as follows : 
Humidity record of the curing room. 
Date. 
Time. 
Air 
tempera- 
ture. 
Psydirometer 
readings. 
Relative 
humid- 
ity. 
Dew 
point. 
Outside air. 
Dry 
bulb. 
Wet 
bulb. 
Tempera- 
ture. 
Hmnid- 
ity. 
Dew 
point. 
1 
Fig. 5. — Side view of tbe humidifier, showing details of construction. 
A covered jar of distilled water should be kept in each room for 
moistening the cloth on the wet bulb of the sling psychrometer. The 
air temperature of the rooms should be determined from standard- 
ized thermometers hung in a permanent position in each room. 
In 2:)ractice it has been found that the number of humidity deter- 
minations in the rooms can eventually be greatly reduced. Usually, 
during ordinary weather, three readings each day will give the 
necessary information for use in handling the humidifier. With 
fluctuating weather conditions the readings will of necessity be 
made more often. . It is very desirable to make at least one, prefera- 
bly more than one, daily determination of the air conditions outside 
