VI 



Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General's Office, Calcutta, 



in the month of January, 1857. 



Monthly Eestjlts. 



Mean height of the Barometer for the month, 

 Max. height of the Barometer, occurred at 10 a. m. on the 6th, 

 Min. height of the Barometer, occurred at 6 P. M. on the 30th, 

 Extreme Range of the Barometer during the month, 



Inches. 

 30.022 

 30.214 

 29.818 

 0.396 



Mean Dry Bulb Thermometer for the month, 

 Max. Temperature, occurred at 3 P. M. on the 30th, 

 Min. Temperature, occurred at 7 A. M. on the 21st, 

 Extreme Range of the Temperature during the month, 



o 



68.0 

 84,9 

 52.8 

 32.1 



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 



61.9 

 6,1 



58.2 



9.8 



Inches. 



0.493 



Troy grains. 

 Mean weight of vapour for the month, ... ... ... 5.44 



Additional weight of vapour required for complete saturation, . . . 2.09 



Mean degree of Humidity for the month, complete saturation being unity, 0.72 



Rained No. days. Max. fall of rain during 24 hours, 

 Total amount of rain during the month, 

 Prevailing direction of the Wind, ... 



Inches. 

 Nil. 

 Nil. 



N. W. & N. 



