lxii Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 

 taken at the Surveyor General's Office, Calcutta, 

 in the month of December, 1860. 



Monthly Eesults. 



Inche3 



Mean height of the Barometer for the month, .. .. 30.012 



Max. height of the Barometer occurred at 9 A. M. on the 31st, .. 30.172 



Min. height of the Barometer occurred at 4 p. m. on the 7th, . . 29.905 



Extreme range of the Barometer during the month, . . . . 0.267 



Mean of the Daily Max. Pressures, .. .. .. 30.092 



Ditto ditto Min. ditto, .. .. .. .. 29.959 



Mean daily range of the Barometer during the month, . . . . 0.133 



o 



Mean Dry Bulb Thermometer for the month, . . . . 67.2 



Max. Temperature occurred at 2 p. w. on the 1st, . . . . 80.4 



Min. Temperature occurred at 6 A. M. on the 31st, . . .. 54.0 



Extreme range of the Temperature during the month, . . . . 26.4 



Mean of the daily Max. Temperature, . . . . . . 78.0 



Ditto ditto Min. ditto, .. .. .. 58.9 



Mean daily range of the Temperature during the month, . . 19.1 



Mean Wet Bulb Thermometer for the month,.. .. .. 60.8 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer, . . 6.4 



Computed Mean Dew-point for the month, .. .. .. 57.0 



Mean Dry Bulb Thermometer above computed Mean Dew-point, .. 10.2 



Inches 

 Mean Elastic force of Vapour for the month, . . . . . . 0.473 



Troy grains 

 Mean Weight of Vapour for the month, .. .. .. 5.23 



Additional Weight of Vapour required for complete saturation, .. 2.12 



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



Inches 

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



Total amount of rain during the month, . . . . . • Nil. 



Prevailing direction of the Wind, . . . . . . N. & N. W. 



