Ixx 
Meteorological Observations. 
Abstract of the Results of the Hourly Meteorological Observations 
taken at the Surveyor General's Office, Calcutta , 
in the month of December , 1861. 
Monthly Kesults. 
Inches 
Mean height of the Barometer for the month, .. 30.008 
Max. height of the Barometer occurred at 10 A. M. on the 6th, 30.164 
Min. height of the Barometer occurred at 4 P. M. on the 16th, 29.850 
Extreme range of the Barometer during the month, .. 0.314 
Mean of the Daily Max. Pressures, 30.077 
Ditto ditto Min. ditto, .. .. 29.955 
Mean daily range of the Barometer during the month, 0.122 
o 
Mean Dry Bulb Thermometer for the month, 66.5 
Max. Temperature occurred at 2 p. m. on the 9th, 79.4 
Min. Temperature occurred at 6 A. M. on the 27th, 56.8 
Extreme range of the Temperature during the month, 22.6 
Mean of the daily Max. Temperature, .. 74.5 
Ditto ditto Min. ditto, .. 60.2 
Mean daily range of the Temperature during the month, 14.3 
Mean Wet Bulb Thermometer for the month,.. .. 61.7 
Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer, 4.8 
Computed Mean Dew-point for the month, .. ., 58.8 
Mean Dry Bulb Thermometer above computed Mean Dew-point, 7.7 
Inches 
Mean Elastic force of Vapour for the month, 0.503 
Troy grains 
Mean Weight of Vapour for the month, 5.56 
Additional Weight of Vapour required for complete saturation, 1.63 
Mean degree of humidity for the month, complete saturation being unity, 0.77 
Inches 
Rained 2 days, Max. fall of rain during 24 hours, 0.26 
Total amount of rain during the month, 0.26 
Prevailing direction of the Wind, .. N. & W. 
