Meteorological Observations. 



ci 



Abstract of the Results of the Hourly Meteorological Observations 

 taken at the Surveyor General's Office, Calcutta, 

 in the month oj December 1874. 



Monthly Results. 



Jnclies. 



Mean lieight of the Barometer for the month ... ... ... 30.039 



Max. height of the Barometer occurred at 10 a. m. on the 31st ... 30.157 



Min. height of the Barometer occurred at 3 a.m. on the 26th ... 29.865 



Extreme range oi the Barometer during the month ... ... 0.292 



Mean of the daily Max. Pressures ... ... ... ... 30.115 



Ditto ditto Min. ditto ... ... ... ... 29.983 



Mean daily range oi the Barometer during the month ... ... 0.132 



Mean Dry Bulb Thermometer for the month 

 Max. Temperature occurred at 3 r. m. on the 30th 

 Min. Temperature occurred at 7 a. m. on the 21st 

 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 



o 

 67.1 



79.3 

 53.9 

 25.4 

 76.4 

 59.4 

 17.0 



Mean Wet Bulb Thermometer for the month 



Mean Dry Bulb Tliermometer 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 



. 60.5 



. 55.2 

 . 11.9 



Inches. 

 . 0.445 



Troy grain. 

 Mean Weight of Vapour for the month ... ... ... 4.93 



Additional Weight of Vapour required for complete saturation ... 2.39 

 Mean degree of humidity for the month, complete satui'ation being unity 0.67 



Mean Max. Solar radiation Thermometer for the month 



o 

 126.0 



Eained no 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 anemo 



meter during the month 

 Prevailing direction of the Wind ... N., N. W. & IS", by E. 



Inches. 

 . Nil. 

 . Nil. 



. Nil. 



* Height 70 feet 10 inches above ground. 



