Meteorological Observations. 



xcv 



Abstract of the Eesults of the Hourly Meteorological Observations 

 taken at the Surveyor GeneraVs Office, Calcutta, 

 in the month of December, 1858. 

 Monthly Eesults. 



Mean height of the Barometer for the month, 



Max. height of the Barometer occurred at 10 A. M. on the 30th, 



Min. height of the Barometer occurred at 4 P. M. on the 13th, 



Extreme range of*the Barometer during the month, 



Mean of the daily Max. Pressures, 



Ditto ditto Min. ditto, 

 Mean daily range of the Barometer during the month, . . 



Inches. 

 30.034 

 30.206 

 29.902 



0.304 

 30.111 

 29.981 



0.130 



Mean Dry Bulb Thermometer for the month, 

 Max. Temperature occurred at 3 4 p. m. on the 31st, 

 Min. Temperature occurred at 7 A. M. on the 23rd, 

 Extreme range of the Temperature during the month, . . 

 Mean of the daily Max. Temperature, 



Ditto ditto Min. ditto, 

 Mean daily range of the Temperatures during the month, 



Mean Wet Bulb Thermometer for the month, 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer, , 



Computed Mean Dew-point for the month, .. 



Mean Dry Bulb Thermometer above computed mean Dew-point, 



Mean Elastic force of Vapour for the month, 



o 

 66.7 



78.8 

 56.4 

 22.4 

 75.2 

 60.2 

 15.0 



o 

 61.9 



4.8 

 59.0 



7.7 



Inches. 



0.506 



Troy grains. 

 Mean Weight of Vapour for the month, .. .. .. 5.60 



Additional Weight of Vapour required for complete saturation, . . 1.63 



Mean degree of humidity for the month, complete saturation being unity, 0.78 



Eained 3 days, Max. fall of rain during 2i hours. 

 Total amount of rain during the month, 

 Prevailing direction of the Wind, 



Inches. 



0.70 



1.08 



N. & N. W. & W. 



