Meteorological Observations. 



xsxix 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor GeneraVs Office, Calcutta, 



in the month of May, 1858. 



Monthly Kesults. 



Mean height of the Barometer for the month, 



Max. height of the Barometer occurred at 9 A. M. on the 10th, 



Min. height of the Barometer occurred at 3 p. m. on the 20th, 



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. 

 29.58G 

 29.815 

 29.201 



0.614 

 29.653 

 29.513 



0.140 



Mean Dry Bulb Thermometer for the month, 

 Max. Temperature occurred at 1 P. M. on the 31st, 

 Min. Temperature occurred at Midnight on the 3rd, 

 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, 



Mean Wet Bulb Thermometer for the month, 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermomcti 



Computed Mean Dew-point for the month, .. 



Mean Dry Bulb Thermometer above computed mean Dew-point, 



Mean Elastic force of Vapour for the month, 



o 



86.0 

 100.6 

 75.8 

 24.8 

 93.6 

 80.4 

 13.2 



o 



80.0 



6.0 



77.0 



9.0 



Indies. 



0.910 



Troy grains. 

 Mean Weight of Vapour for the month, . . . . . . 9.71 



Additional Weight of Vapour required for complete saturation, .. 3.20 



Mean degree of humidity for the month, complete saturation being unity, 0.75 



Rained 10 days, Max. fall of rain during 24 hours, 

 Total amount of rain during the month, 

 Prevailing direction of the Wind, 



Inches. 

 1.81 

 3.28 

 S. & S. E. 



