Meteorological Observations. c 



Abstract, of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General's Ojjice, Calcutta, 



in the month oj December 1873. 



Monthly Results. 



Mean height of the Barometer for the month 



Max. height of the Barometer occurred at 9 a. m. on the 17th 



Min. height of the Barometer occurred at 3 & 4 p. ai. on the 28th 



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. 



30.027 

 30.197 

 29.862 

 0.335 

 30.102 

 29.909 

 , 0.133 



Mean Dry Bulb Thermometer for the month 

 Max. Temperature occurred at 2 p. m. on the 2nd ... 

 Min. Temperature occurred at 6 &7 A. m. on the 31st 

 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 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 



o 

 69.9 



82.7 

 55.5 

 27.2 

 78.5 

 62.8 

 15.7 



,. 63.6 



6.3 



. 58.6 



. 11.3 



Inches. 

 . 0.499 



Troy grain. 

 Mean Weight of Vapour for the month ... ... ... 5.50 



Additional Weight of Vapour required for complete saturation ... 2.18 

 Mean degree of humidity for the month, complete saturation being unity 0.09 



Mean Max. Solar radiation Thermometer for the month 



o 

 128.3 



Inches. 

 Rained 2 days, — Max. fall of rain during 24 hours ... ... 0.82 



Total amount of rain during the month ... ... ... 0.82 



Total amount of rain indicated by the Gauge* attached to the anemo- 

 meter during the month ... ... ... ... ... 0.73 



Prevailing direction of the Wind ... ... E. N. E. & N E. 



* Height 70 feet 10 inches above ground. 



