xiv Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General's Office, Calcutta, 



in the month of February , 1858. 



Monthly Eesults. 



Inches. 



Mean height of the Barometer for the month, . . . . 29.978 



Max. height of the Barometer occurred at 10 A. M. on the 8th, . . 30.142 



Min. height of the Barometer occurred at 4 & 5 P. M. on the 27th, . . 29.821 



Extreme range of the Barometer during the month, . . . . 0.321 



Mean of the Daily Max. Pressures, . . . . . . 30.060 



Ditto ditto Min. ditto, .. .. .. 29.914 



Mean Daily range of the Barometer during the month, . . . . 0.146 



Mean Dry Bulb Thermometer for the month, 

 Max. Temperature occurred at 3 P. M. on the 25th, 

 Min. Temperature occurred at 7 A. M. on the 9th, 

 Extreme range of the Temperature during the month, . . 

 Mean of the Daily Max. Temperature, 



Ditto ditto Min. ditto, 

 Mean Daily range of the Temperature during the month, 



o 



71.0 

 86.9 

 55.0 

 31.9 

 81.6 

 62.0 

 19.6 



o 

 Mean Wet Bulb Thermometer for the month, . . . . 63.0 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer, . . 8.0 



Computed Mean Dew-point for the month, .. .. .. 59.0 



Mean Dry Bulb Thermometer above computed mean Dew-point, . . 12.0 



Inches. 

 Mean Elastic force of Vapour for the month, . . . . 0.506 



Troy grains. 

 Mean Weight of Vapour for the month, .. .. ,. 5.55 



Additional Weight of Vapour required for complete saturation, . . 2.70 



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



Inches. 

 Rained 4 days, Max. fall of rain during 24 hours, . . . . 0.34 



Total amount of rain during the month, . . . . . . 0.54 



Prevailing direction of the Wind, . . . . N. W. & S. W. & W. 



