Meteorological Observations. 



Ixxix. 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor GeneraVs Office, Calcutta, 



in the month of October, 1857. 



Monthly Eestjlts. 



Mean height of the Barometer for the month, 



Max. height of the Barometer, occurred at 9 a. m. on the 14th, 



Min. height of the Barometer, occurred at 6 P. M. on the 1st, 



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, 



Mean Dry Bulb Thermometer for the month, 

 Max. Temperature, occurred at 3 p. m. on the 5th, 

 Min. Temperature, occurred at 6 A. M. on the 29th, 

 Extreme Mange of the Temperature during the month, 

 Mean of the Daily Max. Temperatures, 

 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 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, 



Inches. 

 29.870 

 30.040 

 29.681 



0.359 

 29.938 

 29.810 



0.128 



o 

 81.6 

 91.8 

 72.2 

 19.6 

 87.6 

 76.7 

 10.9 



o 



75.9 



5.7 



73.0 



8.6 



Inches. 



0.801 



Troy grains. 

 Mean weight of vapour for the month, . . . . . . 8.60 



Additional weight of vapour required for complete saturation, . . 2.74 



Mean degree of Humidity for the month, complete saturation being unity, 0.76 



Rained 7 days. Max. fall of rain during 24 hours, 

 Total amount of rain during the month, 

 Prevailing direction of the Wind, 



Inches. 

 0.89 

 1.60 



N. & N. W. 



