liv Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 

 taken at the Surveyor General's Office, Calcutta, 

 in the month of December, 1859. 



Monthly Kestjlts. 



Mean height of the Barometer for the month, 



Max. height of the Barometer, occurred at 9 A. M. on the 24th, 



Min. height of the Barometer, occurred at 5 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, 



Inches 

 30.010 

 30.195 

 29.821 



0.374 

 30.087 

 29.957 



0.130 



o 



Mean Dry Bulb Thermometer for the month, . . . . 68.7 



Max. Temperature occurred at 1 p. m. on the 7th, .. ., 81.9 



Min. Temperature occurred at 6 & 7 A. M. on the 31st, . . . . 54.0 



Extreme range of the Temperature during the month, . . . . 27.9 



Mean of the daily Max. Temperatures, .. .. .. 77.8 



Ditto ditto Min. ditto, .. .. .. 61.6 



Mean daily range of the Temperature during the month, . . 16.2 



o 



Mean Wet Bulb Thermometer for the month, .. .. 63.3 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer, . . 5.4 



Computed Mean Dew Point for the month, . . . . 60.6 



Mean Dry Bulb Thermometer above computed Mean Dew Point, . . 8.1 



Inches 

 Mean Elastic force of vapour for the month, .. *. .. 0.534 



Troy grains. 

 Mean weight of vapour for the month, . . . . . . 5.88 



Additional weight of vapour required for complete saturation, . . 1.81 



Mean degree of humidity for the month, complete saturation being unity, 0.77 



Inches 

 Rained 1 day. — Max. fall of rain during 24 hours, . . . . Nil. 



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



Prevailing direction of the Wind, . . . . . . "N. & N. W. & W 



