Meteorological Observations. 



xxxi 



Abstract of tlie Results of the Hourly Meteorological Observations 

 taken at the Surveyor QeneraVs Office, Calcutta, 

 in the month of September, 1859. 



Monthly Kksttlts. 



Mean height of the Barometer for the month, 



Max. height of the Barometer, occurred at 9 A. M. on the 30th, 



Min. height of the Barometer, occurred at 4 p. M. on the 1st, 



Extreme Range of the Barometer during the month, 



Mean of the Daily Max. Pressures, 



Ditto ditto Min. ditto, 

 Mean daily range of the Barometer during the month, 



Mean Dry Bulb Thermometer for the month, 

 Max. Temperature occurred at 3 P. M. on the 14th, 

 Min. Temperature occurred at 5 a. M. on the 20th, 

 Extreme range of the Temperature during the month, 

 Mean of the daily Max. Temperatures, 



Ditto ditto Min. ditto, 

 Mean daily range of the Temperatures during the month, 



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, .. *. 



Inches . 

 29.699 

 29.938 

 29.474 



0.464 

 29.761 

 29.641 



0.120 



o 

 83.5 

 92.0 



760 

 16.0 

 88.4 

 80.0 

 8.4 



o 



80.4 



3.1 



78.8 



4.7 



Inches. 



0.964 



Troy grains. 

 Mean weight of vapour for the month, . . . . . . 10.34 



Additional weight of vapour required for complete saturation, .. 1.66 



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



f 



liained 21 days. — Max. fall of rain during 24 hours, 

 Total amount of rain during the month, 

 Prevailing; direction of the Wind, 



Inches 



1.96 



11.55 



S.&S.W. 



