Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 



taken at th& Surveyor General' 's Office, Calcutta, 



in the month of September, 1865. 



Monthly Results. 



Mean height of the Barometer for the month, . . 

 Max. height of the Barometer occurred at 10 A. M. on the 26th, 

 Min. height of the Barometer occurred at 4 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, 



Indies 

 29.676 

 29.855 

 29.513 



0.342 

 29.737 

 29.609 



0.128 



Mean Dry Bulb Thermometer for the month, . . 

 Max. Temperature occurred at 2 p. M. on the 18th, 

 Min. Temperature occurred at 7 a. m. on the 14th,- 

 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, 



• • 



84.2 



.. 



93.0 



.. 



75.4 



.. 



17.6 



.. 



89.0 



.. 



80.7 



.. 



8.3 



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, .. .. 



80.7 



3.5 



78.2 



6.0 



Inches 



0.946 



Troy grains 

 Mean Weight of Yapour for the month, .. .. .. 10.13 



Additional Weight of Vapour required for complete saturation, .. 2.11 



Mean degree of humidity for the month, complete saturation being unity, 0.S3 



Eained 21 days, Max. fall of rain during 24 hours, 

 Total amount of rain during the month, .. 



Prevailing direction of the Wind, .. .. 



Inches 

 2.36 



10.25 



E. & N. & S. 



