Meteorological Observations, 



vn 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor GeneraVs Office, Calcutta, 



in the month of January, 1866. 



Monthly Results. 



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



Max. height of the Barometer occurred at 10 A. M. on the 8th, 



Min. height of the Barometer occurred at 4 a. m. on the 6th, 



Extreme Range of the Barometer during the month, 



Mean of the daily Max. Pressures, ... 



Ditto ditto Min. ditto 

 Mean daihj range of the Barometer dnring the month, 



Inches 

 30.041 

 30.221 

 29.848 



0.373 

 30.123 

 29.979 



0.144 



Mean Dry Bulb Thermometer for the month, . . . 

 Max. Temperature occurred at 3 p. m. on the 27th, 

 Min. Temperature occurred at 6 a. m. on the 8th, 

 Extreme range of the Temperature during the month, 

 Mean of the daily Max. Temperature, 



Ditto ditto Min. dittc, ... 

 Mean daily range of the Temperature during the month, 



o 

 69.0 

 84.7 

 55.8 

 28.9 

 78.2 

 61.4 

 16.8 



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, ... 



63.4 



5.6 



58.9 



10.1 



Inches 



0.504 



Troy grains 

 Mean Weight of Vapour for the month, ... ... ... 5.56 



Additional Weight of Vapour required for complete saturation, ... 2.20 



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



Rained 5 days, Max. fall of rain during 24 hours, 

 Total amount of rain during the month, 



Total amount of rain indicated by the Gauge attached to the Aneno- 

 meter during the month, 



Inches 

 0.80 

 1.91 



1.70 



Prevailing direction of the Wind, 



N. & W. & S. 



