XC1V 



Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General's Office, Calcutta, 



in the month of December, 1857. 



Monthly Eesults. 



Mean height of the Barometer for the month, 



Max. height of the Barometer, occurred at 10 a. m. on the 31st, 



Min. height of the Barometer, occurred at 4 P. M. on the 16th, 



Extreme Range of the Barometer during the month, 



Mean of the Daily Max. Pressures, 



Ditto ditto Min. ditto, .. 

 Mean Daily range of the Barometer during the month, 



Mean Dry Bulb Thermometer for the month, 

 Max. Temperature, occurred at 2 p. m. on the 10th, 

 Min. Temperature, occurred at 7 A. M. on the 28th, 

 Extreme Range of the Temperature during the month, 

 Mean of the Daily Max. Temperatures, 



Ditto ditto Min. ditto, 

 Mean Daily range of the Temperature during the month, 



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, 



Inches. 

 30.041 

 30.191 

 29.917 



0.274 

 30.120 

 29.980 



0.140 



o 

 67.4 

 79.6 

 55-9 

 23.7 

 77.5 

 594 

 18.1 



o 



61.1 



6.3 



57.3 



10.1 



Inches. 



0.478 



Troy grains. 

 Mean weight of vapour for the month, .. .. .. 5.28 



Additional weight of vapour required for complete saturation, . . 2.11 



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



Rained No days. Max. fall of rain during 24 hours, 

 Total amount of rain during the month, 

 Prevailing direction of the Wind, .. 



Inches. 

 Nil. 

 Nil 



N. W. & N 



