Meteorological Observations. 



Ixxiv 



Abstract of the Results of the Hour/,// Meteorological Observations 

 taken at the Surveyor General's Office, Calcutta, 

 in the month of September 1870. 

 Monthly Results. 



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 4 p. m. on the 22nd. 



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 ... 



Indies. 



, 29.702 

 , 29.894 

 , 29.487 

 , 0.407 

 29.764 

 29.635 

 , 0.129 



Mean Dry Bulb Thermometer for the month 

 Max. Temperature occurred at 1 p. m. on the 18th & 20th 

 Min. Temperature occurred at 6 a. m, on the 5th. 

 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., 





. 83.2 





. 92.0 





. 77.8 





. 1 4.2 





. 88.3 





. 79.9 





8.4 



Mean Wet Bulb Thermometer for the month ... ... ... 80.0 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer 3.2 



Computed Mean Dew-point for the month ... ... ... 77.8 



Mean Dry Bulb Thermometer above computed mean Dew-point ... 5.4 



Inches. 



Mean Elastic force of Yapour for the month ... ... ... 0.934 



Troy grain. 



Mean Weight of Yapour for the month ... ... ... 10.03 



Additional Weight of Yapour required for complete saturation ... 1*86 

 Mean degree of humidity for the month, complete saturation being unity 0.84 



Mean Max. Solar radiation Thermometer for the month 



o 

 140.0 



Inches. 



Bainecl 24 days, — Max. fall of rain during 24 hours ... ... 2.44 



Total amount of rain during the month ... ... ... 9.01 



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

 meter during the month ... ... ... ... ... 8.38 



Prevailing direction of the Wind S, S S E & S by E. 



* Height 70 feet 10 inches above ground. 



