Meteorological Observations. 



XCT11I 



Abstract of the Results of the Hourly Meteorological Observations 

 taken at the Surveyor General's Office, Calcutta, 

 in the month of December 1870. 

 Monthly Results. 



Inch 



Mean height of the Barometer for the month... 



Max. height of the Barometer occurred at 10 a. m. on the loth 



Min. height of the Barometer occurred at 3 p. m. on th 



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 



Mean Dry Bulb Thermometer for the month 

 Max. Temperature occurred at 3 P. m. on the 31st. 

 Min. Temperature occurred at 6 & 7 a. m, on the 20th. 

 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, 





.. 30.026 



15th. 



.. 30.184, 



21st. 



.. 29.789 





.. 0.395 





.. 30.101 





.. 29.969 





.. 0.132 





o 



. 



.. 66.5 





.. 80.1 



... . 



.. 57.0 





.. 23.1 





75.6 



... • 



.. 59.1 





.. 16.5 



Mean "Wet Bulb Thermometer for the month ... ... ... 60.6 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer 5.9 



Computed Mean Dew-point for the month ... ... ... 55.9 



Mean Dry Bulb Thermometer above computed mean Dew-point ... 10.6 



Inches. 



Mean Elastic force of Vapour for the month ... ... ... 0.456 



Troy grain. 



Mean "Weight of Vapour for the month ... ... ... 5.05 



Additional Weight of Yapour required for complete saturation ... 2'14 

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



o 

 130.2 



Inches. 



Mean Max. Solar radiation Thermometer for the month 



Rained No day, — Max. fall of rain during 24 hours ... ... Nil. 



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



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

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



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



* Height 70 feet 10 inches above ground. 



