!xx Meteorological Observations. 



Abstract of the Results of ilie Hourly Meteorological Observations 



taken at the Surveyor General* s Office, Calcutta, 



in the month of September, 1857. 



Monthly Eesults. 



Indies. 

 Mean height of the Barometer for the month, . . . . 29.705 



Max. height of the Barometer occurred at 11 A. M. on the 21st, . . 29.848 



Min. height of the Barometer occurred at 2 P. M. on the 8th, .. 29.374 



Extreme range of the Barometer during the month, . . . . 0.474 



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Mean Dry Bulb Thermometer for the month, . . . . 82.5 



Max. Temperature occurred at 3 p. m. on the 28th & also 2 P. m. on the 30th, 91.6 

 Min. Temperature occurred at 6 A. M. and also at 7 A. M. on the 9th, . . 75.6 



Extreme range of the Temperature during the month, . . . . 16.0 



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 Mean Wet Bulb Thermometer for the month, . . . . 79.0 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer, . . 3.5 



Computed Mean Dew-point for the month, .. .. .. 77.2 



Mean Dry Bulb Thermometer above computed mean Dew-point, . . 5.3 



Inches. 

 Mean Elastic force of Vapour for the month, . . . . 0.916 



Troy grains. 

 Mean Weight of Vapour for the month, . . . . . . 9.85 



Additional Weight of Vapour required for complete saturation, .. 1.79 



Mean degree of humidity for the month, complete saturation being unity, 0.85 



Inches. 

 Kained 20 days, Max. fall of rain during 24 hours, .. .. 4.10 



Total amount of rain during the month, . . . . . . 13.30 



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



