Meteorological Observations. 



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Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General's Office, Calcutta, 



for the month of September, 1856. 



Monthly Eestjlts. 



Mean height of the Barometer for the month, 

 Max. height of the Barometer, occurred at 10 A. m. on the 30th, 

 Min. height of the Barometer, occurred at 4 a. m. on the 3d, 

 Extreme range of the Barometer, during the month, 



Inches. 

 29.673 

 29.877 

 29.156 

 0.721 



Mean Dry Bulb Thermometer for the month, 

 Max. Temperature, occurred at 2 p. m. on the 1st, 

 Min. Temperature, occurred at 8 a. m. on the 19th, 

 Extreme range of the Temperature, during the month, 



o 



83.4 



91.6 



76.6 



15.0 



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, 



o 



80.3 

 3.1 



78.7 



4.7 



Inches. 



0.961 



Troy grains 

 Mean weight of vapour for the month, .. .. .. 10.31 



Additional weight of vapour required for complete saturation, .. 1.65 



Mean degree of Humidity for the month, complete saturation being unity, 0.86 



Inches. 

 Rained 19 days. Max. fall of rain during 24 hours, .. .. 2.30 



Total amount of rain during the month, .. .. 9.02 



Prevailing direction of the Wind. South and East, 



On Wednesday the 3d, the Barometer at 4 a. m. descended to 29.156 inches, 

 which is the lowest reading we have had for the last three years. After 4 a. m. 

 the Barometer commenced ascending and continuously ascended till midnight: 

 without exhibiting the usual daily tides ; the highest reading of the Barometer on 

 the midnight aforesaid of the 4th, being 29.555 inches. During the time the 

 Barometer was indicating the unusual readings described above, it rained incessantly. 

 Also a high North-easter blew from midnight till 9 a. m., after which a light 

 easterly breeze sprung up which continued for three hours. Finally from 1 p. M. 

 till midnight following there was a high southerly breeze. All tins took place on 

 the 3d ; on the 4th, again the Barometer exhibited the usual daily tides, the weather 

 remaining as unsteady as on the 3d. 



