Vlll 



Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 

 taken at the Surveyor General's Office, Calcutta, 

 in the month of January 1875. 



Monthly Results. 



Mean height of the Barometer for the month 

 Max. height of the Barometer occurred at 9 a. m. on the 2nd 

 Min. height of the Barometer occurred at 4 a.m. on the 19th 

 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 



Inches. 

 . 29.966 

 . 30.146 

 . 29.726 

 , 0.420 

 , 30.038 

 . 29.912 

 , 0.126 



Mean Dry Bulh Thermometer for the month 

 Max. Temperature occurred at 3 r. M. on the 12th 

 Min. Temperature occurred at 7 A. M. on the 23rd 

 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 



Mean Wet Bull) 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 



o 



66.4 

 80.0 

 53.8 

 26.2 

 74.8 

 59.8 

 15.0 



61.7 



4.7 



57.9 



8.5 



Inches. 

 . 0.488 



Mean Weight of Vapour for the month 



Additional Weight of Vapour required for complete saturation 



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



Mean Max. Solar radiation Thermometer for the month ... 



Troy grain. 

 ... 5.39 



j. 78 

 0.75 



o 

 125.0 



Rained 8 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 ancmo 



meter during the month 

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



Inches. 

 . 1 .00 

 . 1.27 



, 1.04 



* Height 70 feet 10 inches above ground. 



