Meteorological Observations. ci 



Abstract of the Results of the Hourly Meteorological Observation* 

 taken at the Surveyor General's Office, Calcutta, 

 in the month of December 1875. 



Monthly Results. 



Indies. 



Mean height of the Barometer for the month ... ... ... 30.017 



Max. height of the Barometer occurred at 9 a.m. on the 24th ... 30.185 



Min. height of the Barometer occurred at 3 A. m. on the 5th ... 29.867 



Extreme range of the Barometer during the month ... ... 0.318 



Mean of the daily Max. Pressures ... ... ... ... 30.092 



Ditto ditto Min. ditto ... ... ... ... 29.959 



Mean daily range of the Barometer during the month ... ... 0.133 



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Mean Dry Bulb Thermometer for the month ... ... ... 69.1 



Max. Temperature occurred at 2 r. m. on the 3rd ... ... 84.2 



Min. Temperature occurred at 6 a. m. on the 19th ... ... ... 57.3 



Extreme range of the Temperature during the month ... ... 26.9 



Mean of the daily Max. Temperature ... ... ... ... 78.4 



Ditto ditto Min. ditto, ... ... ... ... 61.5 



Mean daily range of the Temperature during the month ... ... 16.9 



Mean Wet Bulb Thermometer for the month ... ... ... 62.9 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer 6.2 



Computed Mean Dew-point for the month ... ... ... 57.9 



Mean Dry Bulb Thermometer above computed mean Dew-point ... 11.2 



Inches. 

 Mean Elastic force of Vapour for the month ... ... ... 0.488 



Troy grain. 

 Mean Weight of Vapour for the month ... ... ... 5.37 



Additional Weight of Vapour required for complete saturation ... 2.41 

 Mean degree of humidity for the month, complete saturation being unity 0.69 



o 

 Mean Max. Solar radiation Thermometer for the month ... ... 132.2 



Inches. 

 Rained no days, — Max. fall of rain during 24 hours ... ... Nil 



Total amount of rain during the month ... ... ... Nil 



Total amountof rain indicated by the Gauge* attached to the ancmo- 



meter during the month ... ... ... ... ... Nil 



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



* Height 70 feet 10 inches ahove ground. 



