Ixxvi * Meteorological Observations, 



Abstract of the Hesults of the Hourly Meteorological Obnerrativm 

 taken at the Surveyor General's Office, Calcutta^ 

 in the month oj Septeynber 1874. 



Monthly Hesults. 



Indies. 

 ]\Teaii liei^lit of tlie Barometer for tlie month ... ... ... 29.709 



llax. lieigiit of the Barometer occurred at 9 a. m. on the 11th ... 29.869 



]\iin. heiglit of tlie Barometer occurred at 3 & 4 p. m. on the 23rd ... 29.517 

 l<lxtreme range of the Barometer during the mouth ... ... 0.352 



Mean of tlie daily Max. Pressures ... ... ... ...29.766 



Ditto ditto Min. ditto ... ... ... ... 29.642 



Mean daily range of the Barometer during the mouth ... ... 0.124 



o 



Mean Dry Bulb Tliermometer for the month ... ... ... 82.9 



Max. Temperature occurred at 3 y. m. on the 22nd ... ... 93.7 



]\Iin. Temperature occurred at 8 a. m. on the 11th ... 75.5 



JiJxtreme range of the Temperature during the month ... ... 18.2 



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



Ditto ditto Min. ditto, ... ... ... ... 79.5 



Mean daily range of the Temperature during the month ... ... 8.5 



Mean Wet Bidb Thermometer for the month ... ... ... 80.0 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer 2.9 



Computed Mean Dew-point for the month ... ... ... 78.0 



Mean Dry Bulb Thermometer above computed mean Dew-point ... 4.9 



Inches. 

 Mean Elastic force of Vapour for the month ... ... ... 0.940 



Troy grain. 

 Mean Weight of Vapour for the month ... ... ... 10.09 



Additional Weight of Vapour required for complete saturation ... 1.70 

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



o 

 Mean Max. Solar radiation Thermometer for the month ... ... 140.3 



Inches. 

 Eained 22 days, — Max. ftill of rain during 24 hours ... ... 2.68 



Total amount of rain during the month ... ... ... 12.67 



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

 meter during the month ... ... ... ... ... 11.34 



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



* Height 70 feet 10 iaclies above ground. 



