1835.] 



On the 2\st and 22nd Sept. 1835. 



515 



standard, which I have reason to believe does not differ more than 



•010 (in defect) from the Royal Society's barometer. 



The thermometers were all standards from Newman's, agreeing very 



closely together. 



The diurnal tides for the two days are respectively 0- 140 and 0-116, 



from the former of which must be deducted the gradual decrease of the 



pressurefor 6hours;'732 — -663-f-4z=-01 7,leaving0- 1 23,and" 1 1 6 +■ • 1 23 



-f-2 =01 20 is the mean, which is rather above the usual amount of 



tide for the month of September. The nocturnal tide from 10| p. m. 



to 4| a. m. is -700 — -607 (with allowance for the half hours)— -083. 



The hours of maxima and minima correspond with those used in the 



registers of the Journal, and suggest the expediency of an alteration 



in those fixed for observation by Sir John Herschel, (see page 358.) 



Horary observations of the Barometer, Thermometer, and Hygrometer, made at Calcutta, 

 from 6 A. M. of the 21st to 6 P. M. of the 22nd September, 1835. 







Thermometer 



Wet 



wet 



>> u 









Hour 



Baro- 

 meter 



in t 

 Air. 



he 

 Under 



bulb 



bulb 

 depres- 



•s s 



CO Q 



.s 



S 



Weather. 



21st. 



at 32° 





sky. 



therm. 



sion. 



E be 



X 



£ 





A. M. 6 



29.678 



78.0 



75.2 



75.8 



2.2 







E. 



Scud, cirri above. 



7 



.699 



79.4 





76.2 



3.2 







e. 



do., increasing. 



8 



.715 



80.0 





76.5 



3.5 







0. 



cumuli, clear above. 



9 



.725 



81.8 



SO.O 



76.8 



5.0 







e. 



do. 



10 



.732 



85.0 



85.2 



78.1 



6.9 







e. 



cumuli. 



11 



.702 



84.7 



97.0 



77.7 



7-0 



95 





E. 



do., fine. 



noon. 



.684 



85.6 



100.0 



78.4 



7.2 



94 





E. 



do. 



1 



.656 



86.0 



96.2 



78.3 



7.7 



93 





e. 



overcast. 



2 



.621 



79.2 



91,0 



78.6 



0.6 



100 





e. 



hard shower, clear. 



3 



.592 



83.1 



102.4 



78.8 



4.3 



97 





e. 



fair. 



4 



.592 



82.2 



8S.2 



78.6 



3.6 



97 





e. 



cloudy. 



5 



.595 



82.3 



85.7 



78.7 



3.6 



97 





e. 



do. 



6 



.605 



83.7 



(rain.) 



78.6 



5.1 







e. 



cumuli, rain 6f p.m. 



7 



.646 



78.5 



74.0 



76.8 



1.7 







0. 



rain. 



8 



.657 



79.7 





77.5 



2.2 







e. 



overcast. 



9 



.688 



80.1 





77.4 



2.7 







E. 



do., clearing. 



10 



.696 



795 



76.8 



76.5 



3.0 







e. 



clear night. 



11 



.699 



79.1 





76.4 



2.7 





0.40] e. 



do. 



midnight. 



.682 



78.4 





76.2 



2.2 







e. 



do. 



22nd. 1 



.658 



77.8 





76.4 



1.4 







e. 



do. 



2 



.653 



77.6 





76.4 



1.2 







e. 



cloudy. 



3 



.636 



77.7 





76.5 



1.2 







e. 



overcast. 



4 



.618 



77.5 



75.7 



76.3 



1.2 







e. 



do. 



5 



.621 



77.7 





76.8 



1.1 







E. 



cum. stratus. 



6 



.643 



77.7 



76.8 



76. 4 



1.3 







E. 



do., wet. 



7 



.646 



78.3 





76.5 



1.8 







E. 



do. 



8 



.654 



79-1 





76.6 



2.5 







E. 



do., clearing. 



9 



.662 



80.3 





77.1 



3.2 







E. 



scud. 



10 



.663 



83.0 





78.1 



4.9 







E. 



fine. 



11 



.647 



83.9 





79.6 



4.2 



96 





E. 



cumuli. 



noon. 



.620 



83.4 



93.0 



77.4 



6.0 



94 





E. 



do. 



l 



.595 



80.4 



83.2 



77.6 



2.8 



99 





E. 



rain, dull. 



2 



.568 



81.5 



88.4 



77.5 



4.0 



9S 





E. 



cumuli. 



3 



.544 



81.5 



85-8 



77.5 



4.0 



98 





E. 



overcast. 



4 



.544 



80.4 



79.6 



76.6 



3.8 



99 





e. 



hard rain. 



5 



.547 



79.2 



79.0 



77.2 



2.0 



99 





e. 



do. 



6 



.574 



X77.6 





75.7 



1.9 





0.60 



E. 



clearing. 



Mean 1st 





















24hours, 



29.6605 



80.61 





77.26 



3.35 





0.40 



2byn 



showery. 



Mean 2d 



















24 hours, 



29.6317 



79.58 





76.96 



2.62 





9.60j 



sbysj 



ditto. 



