Meteorological Observatons. xv 



Abstract of the Results of the Hourly Meteorological Observations 

 taken at the Surveyor General's Office, Calcutta, 

 in the month of February 1869. 

 Monthly Results. 



Inches. 



Mean height of the Barometer for the month... ... ... 29.958 



Max. height of the Barometer occurred at 10 a. m. on the 11th. ... 30.133 



Min. height of the Barometer occurred at 5 p.m. on the 2nd. ... 29.692 



Extreme range of the Barometer during the month ... ... 0.441 



Mean of the daily Max. Pressures ... ... ... ... 30.034 



Ditto ditto Min. ditto ... ... ... ... 29.895 



Mean daily range of the Barometer during the month ... ... 0.139 



Mean Dry Bulb Thermometer for the month 

 Max. Temperature occurred at 3 & 4 p. m. on the 25th. 

 Min. Temperature occurred at 6 & 7 a. m. on the 11th 

 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. 



73.5 

 91.5 

 57.5 

 34.0 



81.8 

 67.0 

 14.8 



Mean Wet Bulb Thermometer for the month ... ... ... 67.1 



Mean Dry Bulb Thermometer above Mean "Wet Bulb Thermometer 6.4 



Computed Mean Dew-point for the month ... ... ... 62.6 



Mean Dry Bulb Thermometer above computed mean Dew-point ... 10.9 



Inches. 



Mean Elastic force of Vapour for the month 



0.570 



Troy grain. 



Mean Weight of Vapour for the month ... ... ... 6.23 



Additional Weight of Vapour required for complete saturation ... 2.67 

 Mean degree of humidity for the month, complete saturation being unity 0.70 



Mean Max. Solar radiation Thermometer for the month. 



o 

 122.2 



Inches. 



Rained 4 days, — Max. fall of rain during 24 hours ... ... 1.93 



Total amount of rain during the month ... ... ... 2.72 



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

 meter during the month ... ... ... ... • . . 2.53 



Prevailing direction of the Wind S. S. W., & S. W. 



