TEMPERATURE 



(3) Dry-bulb temperature -3.4 



Wet- bulb temperature -4.7 



Depression 1.3 



65 



7141.1. When the wet-bulb is covered with water and a depression can- 

 not be obtained, the dew-point temperature will be regarded as the same as 

 that of the wet-bulb temperature, 



7142. Rounded Wet- Bulb Temperature. After the depression of the wet 

 bulb has been determined, the wet-bulb temperature will be rounded to the 

 nearest 0.5°C., e.g., a temperature of 61.2° is rounded to 61 .0°; 37.7° to 

 37.5°; 25.3° to 25.5°; -4.7° to -4. 5° etc. This rounded wet-bulb temperature 

 will be used in determining the dew-point temperature from Table 25 (see 

 317144). 



7143. Rounded Depression of the Wet Bulb. If the actual depression of the 

 wet bulb is between 0.0° and 2.0°, this value will be used to find the dew point 

 in Table 25. When the depression is above 2.0°, the value will be rounded 

 to the next .2° by adding .1° and then used with Table 25; e.g., a depression 

 of 1.5° is used directly, a depression of 6.5° is rounded to 6.6°, etc. 



7144. Psychrometric Tables. Table 25, "Temperature of the Dew Point 

 in Degrees Celsius" at the back of this manual, will be used to compute 

 the dew point. To use the tables, find (a) the appropriate wet-bulb temperature 

 in the vertical column printed at the left edge, and (b) the corresponding 

 depression of the wet-bulb. Follow (a) horizontally across, and (b) vertically 

 downward. The tabular value at the intersection is the dew point. 



