xlvi Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 

 taken at the Surveyor General's Office, Calcutta, 

 in the month of December, 1862. 



Monthly -Results. 



Inches 



Mean height of the Barometer for the month, .. .. 29 961 



Max. height of the Barometer occurred at 10 A. M. on the 31st, . . 30.143 



Min. height of the Barometer occurred at 5 P. M. on the 18th, .. 29.808 



"Extreme range of the Barometer during the month, .. .. 0.335 



Mean of the daily Max. Pressures, . . . . . . 30.031 



Ditto ditto Min. ditto, .. .. .. 29.907 



Mean daily range of the Barometer during the month, .. .. 0.127 



o 



Mean Dry Bulb Thermometer for the month, . . . . 66.5 



Max. Temperature occurred at 1 p. M. on the 1st, .. .. 79.8 



Min. Temperature occurred at 7 A. M. on the 30th and 31st, .. 54.8 



Extreme range of the Temperature during the month, . . . . 25.0 



Mean of the daily Max. Temperature, .. .. .. 75.4 



Ditto ditto Min. ditto, .. .. .. 59.2 



Mean daily range of the Temperature during the month, .. 16.2 



Mean Wet Bulb Thermometer for the month, . . .. 60.2 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer, . . 6 3 



Computed Mean Dew-point for the month, .. .. 56.4 



Mean Dry Bulb Thermometer above computed Mean Dew-point, .. 10.1 



Inches 

 Mean Elastic force of Vapour for the month, . . . . . . 0.464 



Troy grains 

 Mean Weight of Vapour for the month, . . . . . . 5.14 



Additional Weight of Vapour required for complete saturation, . . 2.05 



Mean degree of humidity for the month, complete saturation being unity, 0.72 



Indies 

 Rained 3 days, Max. fall of rain during 24 hours, .. v .. 0.20 



Total amount of rain during the month, .. .. .. 0.20 



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



