VI 



Meteorological Observations. 



Abstract of tlie Results of the Hourly Meteorological Observations 



taken at the Surveyor General 's Office, Calcutta, 



in the month of January, 1865. 



Monthly Results. 



Mean height of the Barometer for the month, .. .. 



Max. height of the Barometer occurred at 10 a. m. on the 5th, 

 Min. height of the Barometer occurred at 5 p. M. on the 27th, 

 Extreme range of the Barometer during the mouth, .. 



Mean of the Daily Max. Pressures, .. .. .. 



Ditto ditto Min. ditto, .. 

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



Inches 

 30.066 

 30.238 

 29.844 



0.394 

 30.143 

 30.008 



0.135 



Mean Dry Bulb Thermometer for the month, . . . . 



Max. Temperature occurred at 2 & 3 p. M. on the 26th, .. 

 Min. Temperature occurred at 7 a. m. on the 11th, 



Extreme range of the Temperature during the mouth, .. 



Mean of the daily Max. Temperature, .. .. 



Ditto ditto Min. ditto, .. .. .. 



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



o 

 69.5 

 83.2 

 57.0 

 26.2 

 78.9 

 61.7 

 17.2 



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, .. .. 



62.7 



6.S 



57.3 



12.2 



Inches 

 0.47S 



Troy grains 

 Mean Weight of Vapour for the month, .. .. .. 5.26 



Additional Weight of Vapour required for complete saturation, .. 2.62 



Mean degree of humidity for the month, complete saturation being unity, 0.67 



Rained 2 days, Max. fall of rain during 24 hours, 

 Total amount of rain during the month, .. 



Prevailing direction of the Wind, .. .. 



Inches 

 0.32 



0.48 

 N. & N. W. 



