Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General's Office, Calcutta, 



in the month of April, 1857. 



Monthly Results. 



Inches. 

 Mean height of the Barometer for the month, .. .. 29.760 



Max. height of the Barometer occurred at 10 A. M. on the 7th and 



11 p. m. on the 8th, . . . . . . . . 29.932 



Min. height of the Barometer occurred at 6 P. M. on the 16th, .. 29.528 



Extreme range of the Barometer during the month, . . . . 0.404 



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Mean Dry Bulb Thermometer for the month, . . . . 83.2 



Max. Temperature occurred at 3 p. m. on the 30th, .. .. 98.8 



Min. Temperature occurred at 4 & 5 A. M. on the 9th, . . . . 69.4 



Extreme range of the Temperature during the month, . . . . 29.4 



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Mean Wet Bulb Thermometer for the month, . . . . 76.2 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer, . . 7,0 



Computed Mean Dew-point for the month, .. .„ „. 72.7 



Mean Dry Bulb Thermometer above computed mean Dew-point, . . 10.5 



Inches. 

 Mean Elastic force of Vapour for the month, . . . . 0.792 



Troy grains. 

 Mean Weight of Vapour for the month, . . . . . . 8.49 



Additional Weight of Vapour required for complete saturation, ., 3.40 



Mean degree of humidity for the month, complete saturation being unity, 0.71 



Inches. 

 Kained 10 days, Max. fall of rain during 24 hours, .. .. 1.13 



Total amount of rain during the month, . . . . . . 1.80 



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



