lxxiii Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 

 taken at the Surveyor General's Office, Calcutta, 

 in the month of September 1869. 

 Monthly Results. 



Inches. 



Mean height of tlie Barometer for the month... ... 29.691 



Max. height of the Barometer occurred at 10 a. m. on the 30th. ... 29.841 



Min. height of the Barometer occurred at op. m. on the 2nd. ... 29^41 



Extreme range of the Barometer during the month ... 0.300 



Mean of the daily Max. Pressures ... ... ... ...29.751 



Ditto ditto Min. ditto ... ... ... \'~ 29.624 



Mean daily range of the Barometer during the month ... ... 0.127 



o 



Mean Dry Bulb Thermometer for the month ... 83.1 



Max. Temperature occurred at 2 p. m. on the 21st. 92.0 



Min. Temperature occurred at 5, 6, & 7 a. m, on the 23rd & 24th.... 78.0 



Extreme range of the Temperature during the month 14.0 



Mean of the daily Max. Temperature ... ... 88.0 



Ditto ditto Min. ditto, ... ... 80.0 



Mean daily range of the Temperature during the month... ... 8.0 



Mean Wet Bulb Thermometer for the month ... ... ... 80.4 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer 2.7 



Computed Mean Dew-point for the month ... ... ... 78.5 



Mean Dry Bulb Thermometer above computed mean Dew-point ... 4.6 



Inches. 



Mean Elastic force of Yapour for the month ... ... ... 0.955 



Troy grain. 



Mean Weight of Vapour for the month ' ... ... ... 10.25 



Additional Weight of Vapour required for complete saturation ... 1.61 

 Mean degree of humidity for the month, complete saturation being unity 0.86 



o 

 Mean Max. Solar radiation Thermometer for the month ... 128.6 



Inches. 



Rained 26 days, — Max. fall of rain during 24 hours ... ... 1.88 



Total amount of rain during the month ... ... ... 7.91 



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

 meter during the month ... ... ... ... ... 7.20 



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



