Meteorological Observatons. vii 



Abstract of the Results of the Hourly Meteorological Observations 

 taken at the Surveyor General's Office, Calcutta, 

 in the month of January 1869. 

 Monthly Results. 



Indies. 



Mean height of the Barometer for the month... ... ... 30.054 



Max. height of the Barometer occurred at 10 a. m. on the 15th. ... 30.294 



Min. height of the Barometer occurred at 4 p.m. on the 24th. ... 29.864 



Extreme range oft. the Barometer during the month ... ... 0.430 



Mean of the daily Max. Pressures ... ... ... ... 30.134 



Ditto ditto Min. ditto ... ... ... ... 29.996 



Mean daily range of the Barometer during the month ... ... 0.138 



Mean Dry Bulb Thermometer for the month 

 Max. Temperature occurred at 3 p. m. on the 24th. 

 Min. Temperature occurred at 7 A. M. on the 10th ... 

 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. 



69.5 

 85.8 

 56.3 

 29.5 

 78.1 

 62.4 

 15.7 



Mean Wet Bulb Thermometer for the month ... ... ... 63.4 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer 6.1 



Computed Mean Dew-point for the month ... ... ... 58.5 



Mean Dry Bulb Thermometer above computed mean Dew-point ... 11.0 



Inches. 



Mean Elastic force of Vapour for the month 



0.498 



Troy grain. 



Mean Weight of Vapour for the month ... ... ... 5.48 



Additional Weight of Vapour required for complete saturation ... 2.40 

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



Mean Max. Solar radiationTemperature for the month. 



115.4 



Inches. 



Rained 3 days, — Max. fall of rain during 24 hours 

 Total amount of rain during the month 



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

 meter during the month 

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



0.78 

 0.90 



