lxxvii 



Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General's Office, Calcutta, 

 in the month of September 1875. 



Monthly Results. 



Mean height of the Barometer for the month 

 Max. height of the Barometer occurred at 9 a. m. on the 22nd 

 Min. height of the Barometer occurred at 3 p. m. on the 9th 

 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. 



. 29.704 

 . 29.915 

 . 29.457 

 , 0.458 

 , 29.765 

 . 29.635 

 , 0.130 



Mean Dry Bulb Thermometer for the month ... ,., 



Max. Temperature occurred at 1 ?. M. on the 12th 

 Min. Temperature occurred at 3 & 9 a. m. on the 9th & 17th 

 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 



82.8 

 91.7 

 77.8 

 13.9 

 87.9 

 79.7 

 8.2 



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 



80.0 

 2.8 



78.0 

 4.8 



Indies. 

 0.940 



Troy grain. 

 Mean Weight of Vapour for the month ... ... ... 10.09 



Additional Weight of Vapour required for complete saturation ... 1.66 

 Mean degree of humidity for the month, complete saturation being unity 0.86 



Mean Max. Solar radiation Thermometer for the month 



o 

 139.4 



Pained 24 days, — Max. fall of rain during 24 hours 



Total amount of rain during the month 



Total amountof rain indicated by the Gauge* attached to fcht 



meter during the moirth 

 Prevailing direction of the Wind 



Inches. 

 ,. 2.14 

 . 7.41 



e anemo- 



S, S, S, W. & S, S, E. 



6.86 



* Height 70 feet 10 inehes above ground. 



