Meteorological Observations. 



lxxi 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General's Office, Calcutta, in the 



month of September 1866. 



Monthly Results. 



Moan height of the Barometer for the month... 



Max. height of the Barometer occurred at 10 a. m. on the 23rd 



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. 



29.666 

 29.855 

 29.444 



0.411 

 29.724 

 29.597 



0.127 



Mean Dry Bulb Thermometer for the month ... 

 Max. Temperature occurred at 3 p. m. on the 30th 

 Min. Temperature occurred at 5 a. m. on the 26th 

 JC.vtreme 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. 



83.4 

 93.6 



78.0 

 15.6 

 89.5 

 80.5 

 9.0 



Mean Wet Bulb Thermometer for the month ... ... ... 81.0 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer 3.3 



Computed Mean Dew-point for the month ... ... ... 78.7 



Mean Dry Bulb Thermometer above computed mean Dew-point ... 5.6 



Inches. 

 Mean Elastic force of Vapour for the month ... ... ... 0.961 



Troy grain. 



Mean Weight of Vapour for the month ... ... ... 10.29 



Additional Weight of Vapour required for complete saturation ... 1.99 

 Mean degree of humidity for the month, complete saturation being unity 81 



Inches. 



Rained 23 days, — Max. fall of rain during 24 hours ... ... 3.84 



Total amount of rain during the month ... ... ... 15.97 



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

 meter during the month ... ... ... ... ... 15.07 



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



