Meteorological Observa tions. 



XXXIX 



Abstract of the Results of the Hourly Meteorological Observations 



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



month of May 1866. 



Monthly* Results. 



Mean height of the Barometer for the month,... 



Max. height of the Barometer occurred at 9 a. m. on the 1st, 



Min. height of the Barometer occurred at 5 p. m. on the 29th, 



Extreme range of the Barometer during the month, 



Mean of the daily Max. Pressures, 



Ditto ditto Min. ditto 

 Mean dally range of the Barometer during the month, ... 



Inches. 



29.646 

 29.900 

 29.476 



0.424 

 29.708 

 29.571 



0.137 



Mean Dry Bulb Thermometer for the month, 

 Max. Temperature occurred at 3 p. M. on the 27th 

 Min. Temperature occurred at 5 a. m. on the 3rd ... 

 Extreme range of the Temperature during the month, 

 Mean of the daily Max. Temperature ... 



Ditto ditto Min. ditto, 

 Mean dally range of the Temperature during the month,.., 



87.0 

 105.8 

 71.7 

 34.1 

 96.1 

 79.6 

 16.5 



Mean Wet Bulb Thermometer for the month, ... ... ... 80.7 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer, 6.3 



Computed Mean Dew-point for the month, ... ... ... 76.9 



Mean Dry Bulb Thermometer above computed mean Dew-point. ... 10.1 



Inches. 

 Mean Elastic force of Vapour for the month, ... ... ... 0.908 



Troy grains. 



Mean Weight of Vapour for the month ... ... ... 9.66 



Additional Weight of Vapour required for complete saturation, ... 3.63 

 Mean degree of humidity for the month, complete saturation being unity 0.73 



Inches. 



Rained 9 days, — Max. fall of rain during 24 hours ... ... 0.88 



Total amount of rain during the month, ... ... ... 2.56 



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

 meter during the month. ... ... ... ... ... 1.85 



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



