28 



Meteorological Observations. 



[Jan. 



Barometer and Thermometer. 



The next two tables require no explanation ; they shew the usual 

 range of the atmospherical pressure and temperature throughout the year. 



The registers of the Barometer have been uniformly reduced to 

 the temperature of 32° Fahr. which greatly facilitates their applica- 

 tion to useful purposes. The periods of diurnal minima and maxima 

 also have wisely been chosen for observation, but it is to be regretted 

 that the same precaution could not have been extended to the parallel 

 hours of the night. 



Table II. — Mean Atmospherical Pressure in Calcutta, for 1829-30-31. 

 Barometer reduced to 32° Fahrenheit. 







Maximum 



Apparent 



(for 1830- 



Minimum 





Month. 



Sun-rise. 



Pressure at 



31) 2h.50m. 



Pressure, 



Sun-set. 







9 h. 40 m. 



noon. . 



P. M. 



4 P. M. 







inches. 



inches. 



inches. 



inches. 



inches. 



inches. 



Jan. 



30.034 



30.084 



30.033 



30.019 



29.961 



29.971 



Feb. 



29.959 



29,995 



29.960 



29.904 



29.878 



29.892 



March, 



.877 



.922 



.885 



.825 



.797 



.808 



April, 



.748 



.796 



.763 



.721 



.672 



.685 



May, 



.625 



.670 



.638 



.579 



.555 



.579 



June, 



.526 



.563 



.532 



.497 



.468 



.484 



July, 



.558 



.591 



.571 



.529 



.501 



.520 



August, 



.589 



.624 



.599 



.532 



.525 



.537 



Sept. 



.655 



.700 



.667 



.616 



.599 



.609 



Oct. 



.796 



.839 



.792 



.736 



.729 



.743 



Nov. 



.935 



.978 



.928 



.875 



.871 



.916 



Dec. 



30.038 



30.079 



30.025 



.971 



.965 



.978 



Means 



29.778 



29.818 



29.783 



29.734 



29.710 



29,727 



Mean of the columns of maxima and minima for three years, 29,764 

 Table III. — Mean Thermometrical Range for the same period. 





Minimum 







Maximum 







Month. 



temperature 

 Sunrise. 



IX. 40 a.m. 



Apparent 

 noon. 



temperature 

 2h. 50m P.iM 



IV. V. M. 



Sun*set. 



Jan. 



56°.8 



67°.5 



73°. 5 



77°.5 



75 6 .3 



70". 1 



Feb. 



63.6 



74 7 



77.9 



82.1 



82.0 



76.5 



March, 



72.8 



80.0 



84.4 



86.8 



86.4 



81.2 



April, 



76.6 



85.8 



89.6 



91.2 



90.5 



85.3 



May, 



79.9 



88.4 



91.3 



93.6 



91.4 



86.6 



June, 



80.5 



85 6 



88.6 



88.1 



86.8 



83.8 



July, 



80.3 



84.3 



85.6 



86.4 



85.1 



82.9 



August, 



79.4 



84.4 



85.5 



85.3 



84.4 



82.5 



Sept. 



79.4 



84.9 



86.1 



85.6 



84.7 



82.9 



Oct. 



77.1 



83.2 



85.6 



85.5 



84.1 



81.1 



Nor. 



66.7 



74.8 



78.8 



80.1 



78.7 



75.4 



Dec. 



59.7 



„ 69.7 



74.9 



76.8 



75.4 



70.9 



Means 



72.73 



81.11 



83.49 



84.89 



83.57 



79.86 



Mean of extremes, 78.81 



Mean temperature of the day, 81.26 



of the night 75.00 



Deduced mean of the 24 hours, 78.13 



Mean temperature of Calcutta in 1784-5 78°.0 (As. Res. IV.) 



To place the relative course of the two instruments in a more con- 

 venient form for comparison, the following tabular view of their rang© 



