Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General's Office, Calcutta, 



in the month of October, 1865. 



Monthly Eesults. 



Mean height of the Barometer for the month, 

 Max. height of the Barometer occmrred at 10 a. si. on the 15th, 

 Min. height of the Barometer occurred at 4 p. m. on the 2nd, 

 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, ., 



Indies 

 29.848 

 30.005 

 29.640 



0.365 

 29.917 

 29.790 



0.127 



Mean Dry Bulb Thermometer for the month, . . 

 Max. Temperature occurred at 5 p. M. on the 9th, 

 Min. Temperature occurred at 6 A. M. on the 25th, 

 Extreme range of the Temperature during the month, 

 Mean of the daily Max. Temperature, 

 Ditto ditto Min. ditto, .. 

 Mean daily range of the Temperature during the month, 



84.4 

 93.4 

 72.6 

 20.8 

 91.0 

 78.8 

 12.2 



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, , . .. 



77. 4 



7.0 



72.5 



11.9 



Inches 



0.787 



Troy grains 

 Mean Weight of Vapour for the month, .. .. ., 8.42 



Additional Weight of Vapour required for complete saturation, ., 3.39 



Mean degree of humidity for the month, complete saturation being unity, 0.68 



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. 

 .. W. & S. 



