Meteorological Observations. Ixxi 



Abstract of the Results of the Hourly Meteorological Observations 

 taken at the Surveyor GeneraVs Office, Calcutta, 

 in the month of September, 1858. 



Monthly Kesults. 



Inches. 



Mean height of the Barometer for the month, - » . . 29.689 



Max. height of the Barometer, occurred at 9 a. m. on the 29th, .. 29.892 



Min. height of the Barometer, occurred at 5 P. m. on the 14th, . . 29.440 



Extreme Range of the Barometer during the month, . . . . 0.452 



Mean of the Daily Max. Pressures, .. .. .. 29.754 



Ditto ditto Min. ditto, .. .. .. .. 29.620 



Mean Daily range of the Barometer during the month, .. .. 0.134 



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Mean Dry Bulb Thermometer for the month, .. .. 83.9 



Max. Temperature, occurred at 3 and 4 p. m. on the 13th and 14th, .. 95.0 



Min. Temperature, occurred at 2, 3 and 6 A. M. on the 27th and 28th,,. 78.0 



Extreme Mange of the Temperature during the month, . . . . 17.0 



Mean of the Daily Max. Temperature, . . . . . . 88.9 



Ditto ditto Min. ditto, .. .. .. 80.5 



Mean Daily range of the Temperature during the month,,. .. 8.4 



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Mean Wet Bulb Thermometer for the month, .. .. 80.5 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer, . . 3.4 



Computed Mean Dew Point for the month, . . . . 78.8 



Mean Dry Bulb Thermometer above computed Mean Dew Point, . . 5.1 



Inches. 

 Mean Elastic force of vapour for the month, .. ,. .. 0.964 



Troy grains . 

 Mean weight of vapour for the month, . . . . . . 10.34 



Additional weight of vapour required for complete saturation, . . 1.79 



Mean degree of Humidity for the month, complete saturation being unity, 0.85 



Inches. 

 Eained 22 days. Max. fall of rain during 24 hours, . . . . 0.65 



Total amount of rain during the month, . . . . . . 4.74 



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



