Meteorological Observations. Vii 
Abstract of the Results of the Hourly Meteorological Observations 
taken at the Surveyor General’s Office, Calcutta, 
in the month of January, 1866. 
Montuty Resvuts. 
Inches 
Mean height of the Barometer for the month, . si ww. 30.041 
Max. height of the Barometer occurred at 10 A. M. on the sth, «. 90.221 
Min. height of the Barometer occurred at 4 A. M. on the 6th, ... 29.848 
Extreme Range of the Barometer during the month, 500 ww. = 0.878 
Mean of the daily Max. Pressures, ... Sob uae ... 30.123 
Ditto ditto Min. ditto ... val er 29-979 
Mean daily range of the Barometer during the month, .., oe «= 0.144 
Co) 
Mean Dry Bulb Thermometer for the month, ... ae 30 69.0 
Max. Temperature occurred at 3 p. u. on the 27th, is 601 84.7 
Min. Temperature occurred at 6 a. M. on the 8th, a S00 55.8 
Extreme range of the Temperature during the month, Bre ood 28.9 
Mean of the daily Max. Temperature, 6% soc 660 78.2 
Ditto ditto Min. dittce, ... nee aah er 61.4 
Mean daily range of the Temperature during the month, ... ee 16.8 
Mean Wet Bulb Thermometer for the month, sia 63.4 
Mean Dry Bulb Thermometer above mean Wet. Bulb ee are sas 5.6 
Computed Mean Dew-point for the month, ... a bee 58.9 
Mean Dry Bulb Thermometer above computed mean Dew- Le Bee 10.1 
Inches 
Mean Elastic force of Vapour for the month, .., a .. 0.504 
Troy grains 
Mean Weight of Vapour for the month, ee 563 5.56 
Additional Weight of Vapour required for complete saturation, aan 2.20 
Mean degree of humidity for the month, complete saturation being unity, 0.72 
Inches 
Rained 5 days, Max. fall of rain during 24 hours, she sek 0.80 
Total amount of rain during the month, BA Say EL 
Total amount of rain indicated by the Gauge attached a “ie ee 
meter during the month, ae a bbe a 1.70 
Prevailing direction of the Wind, .., 500 me N. & W.& 5S. 
