Meteorological Observations. 



lxxxi 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General's Office, Calcutta, 



in the month, of October 1869. 



Monthly Results. 



Inches. 



Mean hei gkt of the Barometer for the month... ... ... 29.820 



Max. height of the Barometer occurred at 10 a. m. on the 28th. ... 30.026 



Min. height of the Barometer occurred at 3 a. m. on the 8th. ... 29.515 



^Extreme range of the Barometer during the month ... ... 0.511 



Mean of the daily Max. Pressures ... ... ... ... 29.885 



Ditto ditto Min. ditto ... ... ... ... 29.761 



Mean daily range of the Barometer during the month'" ... ... 0.124 



Mean Dry Bulb Thermometer for the month 

 Max. Temperature occurred at noon on the 3rd. 

 Min. Temperature occurred at 6 a. m, on the 29th. 

 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. 



81.4 

 90.6 

 71.0 

 19.6 

 87.0 

 77.3 

 9.7 



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 



77.0 

 4.4 



73.9 

 7.5 



Inches. 



. 0.824 



Troy grain. 

 Mean Weight of Vapour for the month ... ... ... 8.87 



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

 Mean degree of humidity for the month, complete saturation being unity 0.79 



Mean Max. Solar radiation Thermometer for the month ... 



o 



128.S 



Inches. 



Rained 13 days, — Max. fall of rain during 24 hours ... ... 1.49 



Total amount of rain during the month ... ... ... 3.03 



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

 meter during the month ... ... ... ... ... 2.67 



Prevailing direction of the Wind S. S. E. & variable. 



