Meteor o logica I Ob sew alio n s . 



Vll 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General* s Office, Calcutta, 



in the month of January, 1858. 



Monthly Besults. 



Inches. 



Mean height of the Barometer for the month, . . . . 29.994 



Max. height of the Barometer occurred at 10 A. M. on the 30th, . . 30.208 



Min. height of the Barometer occurred at 4 P. M. on the 21st, . . 29.812 



Extreme range of the Barometer during the month, . . . . 0.396 



Mean of the Daily Max. Pressures, . . . . . . 30.078 



Ditto ditto Min. ditto, .. .. .. 29.931 



Mean Daily range of the Barometer during the month, . . . . 0.147 



Mean Dry Bulb Thermometer for the month, 

 Max. Temperature occurred at 3 P. m. on the 18th, 

 Min. Temperature occurred at 7 A. m. on the 15th, 

 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 



68.1 

 84.0 

 56.2 

 27.8 

 78.3 

 60.3 

 18.0 



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 



61.4 

 6.7 



57.4 



10.7 



Inches. 



0.480 



Troy grains. 

 Mean Weight of Vapour for the month, . . . . . . 5.29 



Additional Weight of Vapour required for complete saturation, . . 2.26 



Mean degree of humidity for the month, complete saturation being unity, 0.70 



Rained 3 days, Max. fall of rain during 2 1 hours, 

 Total amount of rain during the month, 

 Prevailing direction of the Wind, 



Inches. 



0.07 



0.07 



N. W. & S. W. & W. 



