Meteorological Observations. 



xxxi 



Abstract of the Results of tlie Hourly Meteorological Observations 



taken at the Surveyor General 1 s Office, Calcutta, 



in the month of April, 1859. 



Monthly Results. 



Mean height of the Barometer for the month, 

 Max. height of the Barometer, occurred at midnight on the 1st, 

 Min. height of the Barometer, occurred at 5 P. M. on the 25th, 

 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 2 P. M. on the 22nd, 

 Min. Temperature occurred at 6 A. M. on the 11th, 

 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, . . 



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. 

 29.809 

 30.060 

 29.632 



0.428 

 29.882 

 29.732 



0.150 



o 



84.5 

 98.0 

 68.9 

 29.1 

 93.6 

 77.1 

 16.5 



o 



76.8 



7.7 



72.9 



11.6 



Inches. 



0.797 



Troy grains. 

 Mean weight of vapour for the month, . . . . . . 8.52 



Additional weight of vapour required for complete saturation, . . 3.83 



Mean degree of Humidity for the month, complete satiu'ation being unity, 0.69 



B-ained 4 days. — Max. fall of rain during 24 hours, 

 Total amount of rain during the month, 

 Prevailing direction of the Wind, . 



Inches. 



0.97 



1.29 



S. &S. E.&S. W. 



