liv Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General's Office, Calcutta, 



in the month of July, 1857. 



Monthly Eesults. 



Inches. 

 Mean height of the Barometer for the month, .. .. 29.547 



Max. height of the Barometer occurred at 9 A. M. on the 28th, . . 29.756 



Min. height of the Barometer occurred at 4 A. M. on the 6th, . . 29.328 



Extreme range of the Barometer during the month, . . . . 0.428 



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Mean Dry Bulb Thermometer for the month, . . . . 82.2 



Max. Temperature occurred at Noon & 1 p. M. on the 10th & 13th,.. 90.0 



Min. Temperature occurred at 10 & 11 P. M. on the 22nd, . . 77.2 



Extreme range of the Temperature during the month, . . . . 12.8 



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Mean Wet Bulb Thermometer for the month, .. .. 79.5 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer, . . 2.7 



Computed Mean Dew-point for the month, . . . . . . 78.1 



Mean Dry Bulb Thermometer above computed mean Dew-point, . . 4.1 



Inches. 

 Mean Elastic force of Vapour for the month, . . . . 0.943 



Troy grains. 

 Mean Weight of Vapour for the month, . . . . . . 10.14 



Additional Weight of Vapour required for complete saturation, .. 1.40 



Mean degree of humidity for the month, complete saturation being unity, 0.88 



Inches. 

 Rained 27 days, Max. fall of rain during 24 hours, . . . . 2,20 



Total amount of rain during the month, . . . . . . 12.98 



Prevailing direction of the Wind, .. .. .. S. 



