16 



Fifth Memoir on the Law of Storms. 



[No. 121. 



intervals, ship straining and labouring very heavy, took in the foresail 

 occasionally — Daylight ditto weather, with a high confused sea. Noon 

 more moderate gale, decreasing weather, winds WSW. strong breezes, 

 cloudy, with a heavy sea. Midnight, strong breezes and cloudy, lat. at 

 noon 11°. 56' N. 



Report from Captain Campbell, Assistant Surveyor General, Madras. 



I have the honor to report that the Barometers at Royacottah and 

 Bangalore were affected by the Storm which took place at Madras 

 at 2 a. m. of Sunday the 16th May 1841, and that at Royacottah the 

 force of the gale was felt for some hours. 



The observations at Royacottah were made by myself, with an open 

 cistern instrument, on the plan described in the 29th No. of the Madras 

 Journal, with a tube 3-10 inch in diameter, filled and boiled by myself. 



The observations at Bangalore were made by the Rev. John Garrett, 

 of the Wesleyan Mission, with one of Newman's iron cistern Barometers, 

 with a tube filled and boiled by myself for the Medical Board at Madras, 

 which on frequent comparison never differed the 1- 100th part of an inch 

 from my own. 



The observations are reduced, except for temperature, as the variation 

 from 80° of Fahrenheit by either instrument was but three or four 

 degrees. 



10 



A.M. 







4 P.M. 





Royacottah. 



1 

 Bangalore. ! Difference. 



Royacotta. 



Bangalore. 



Difference. 



12th, 27,113 



27,148 



•o;>5 



26,991 



27,041 



•050 



33th, 27,055 



27,126 



Xll 



26,949 



26,974 



•025 



14th, 



27,070 



,, 



26,937 



26,958 



021 



15th, 27,023 



27,056 



•032 



26,911 



26,948 



•037 



16th, 26,963 



26,972 



•009 



26,859 



,, 





17th, 26,901 



26,956 



•055 



26,843 



26,888 



•045 



18th, 26,963 



27,007 



•044 



26,883 



26,923 



•040 



19th, 27,035 



27,083 

 27,113 

 26,901 



•048 



26,959 



26,984 



025 





0,212 Extrt 



:me Depression 



on 17th. 







Depression greatest at Royacottah by *0-4 inch. 



The very slight variations in the difference of the observations between 

 the two instruments at a distance of forty miles, shews that the observa- 

 tions deserve the utmost confidence. The greatest depression observed 

 was at Royacottah on the 17th, equal to 021 2 inch below the pressure 

 on the 12th. 



