Meteorological Observations. 



xcvn 



Abstract of the Results of the Hourly Meteorological Observations 

 taken at the Surveyor General's Office, Calcutta, 

 in the month of December 1869. 

 Monthly Results. 



Inches. 



Mean height of the Barometer for the month... ... ... 29.993 



Max. height of the Barometer occurred at 10 a. m. on the 28th. ... 30.139 



Min. height of the Barometer occurred at 4 p.m. on the 3rd. ... 29.832 



Extreme range of the Barometer during the month ... ... 0.307 



Mean of the daily Max. Pressures ... ... ... ... 30.070 



Ditto ditto Min. ditto ... ... ... ... 29.939 



Mean daily range of the Barometer during the month ... ... 0.131 



Mean Dry Bulb Thermometer for the month 

 Max. Temperature occurred at 2 & 3 p. m. on the 1st & 2nd 

 Min. Temperature occurred at 7 a. m, on the 30th. 

 Extreme range of the Temperature during the month 

 Mean of the daily Max. Temperature ... 



Ditto ditto Min. ditto, 

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



68.5 

 79.5 

 56.8 

 22.7 

 77.6 

 61.3 

 16.3 



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 



62.0 



6.5 



. 56.8 



11.7 



Inches. 

 , 0.470 



Troy grain. 



Mean Weight of Vapour for the month ... ... ... 5.18 



Additional Weight of Vapour required for complete saturation ... 2.47 

 Mean degree of humidity for the month, complete saturation being unity 0.68 



Mean Max. Solar radiation Thermometer for the month 



o 

 114.1 



Inches. 



Rained no days, — Max. fall of rain during 24 hours ... ... Nil 



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



Total amount of rain indicated by the Gauge attached to the anemo- 

 meter during the month ... ... ... ... ... Nil 



Prevailing direction of the Wind.., 



N.N.E.,W.byN.&W.N,W. 



