Injury from Cold During Growing Period. 129 

 Table for Computing the Dew Point in Degrees Fahrenheit. 



Wet-Bulb Depkession. 



Dry 



Bulb. 



209. To Compute the Dew Point. Find the wet-bulb 

 depression by subtracting the wet-bulb reading from that 

 of the dry bulb; locate this in the top line of the table, 

 and find the dry-bulb reading in the left hand vertical 

 column. Opposite the dry bulb reading, in the column 

 headed with the number indicating the wet-bulb depres- 

 sion, is the dew point sought. 



Example: Dry-bulb reading 47° 



Wet-bulb reading .iO^ 



AVet-bulb depression 7 ° 



