AfefeoroJogica I Ohserra fions. 



XV 



dhsiract of ihe Besults of the Hourly Meteorological Observation. 



taken at the Surveyor General's Office, CalctUta, 



in the month of February 1877. 



Monthly liEsui/rs. 



Indies. 



Mean lieicflit of tlie Barometer for tlie montli ... ... ... 30.032 



Max.lieiglitoftlie Barometer occurred at 10 a. m. on tlie IStli ... 30.223 



Min. lieiglit of tlje Barometer occurred at 3 p. m. on tlie 4tli ... 29.813 



H^xtreme range o^ tlie Barometer during the raontk ... ... 0.410 



Mean of tlie daily Max. Pressures ... ... ... ... 30.108 



Ditto ditto Min. ditto ... ... ... ... 29.977 



Mean daily range oi the Barometer during tlie month ... ... 0.131 



Mean Dry Bulb Thermometer for the month 

 Max. Temperature occurred at 4 p. m. on the 28th 

 Min. Temperature occurred at 6 a. m. on the 4th & 11th 

 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 



68.0 

 86.0 

 56.0 

 30.0 

 76.3 

 60.9 

 15.4 



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 



62.0 

 6.0 



67.2 

 10.8 



inches. 

 0.476 



Grain. 

 Mean Weight of Vapour for the month ... ... ... 5.25 



Additional Weight of Vapour required for complete saturation ... 2.28 

 Mean degree of humidity for the month, complete saturation being unity 0.70 



Mean Max. Solar radiation Thermometer for the month 



o 

 130.7 



Inches. 

 Eained 7 days, — Max. fall of rain during 24 hours ,,. ... 1.00 



Total amount of rain during the month ... ... ... 2.26 



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

 meter during the month ... ... ... ... 1.61 



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



* Height 70 feet 10 inches above ground. 



