1849.] Seventeenth Memoir on the Law of Storms. 273 



about North, blowing strong, with squalls and lightning to the S. E,, a confused 

 swell since 4 p. m. The fleet at midnight was by acct. in Lat. 21° 21' N. ; Long. 

 122° 38' East. 



2nd July. — Midnight to Noon increasing to a strong gale with hard squalls ; 

 every preparation making for bad weather. At 8 a. m., wind N. b. W., to N. 

 N. W. Noon N. b. W.; Lat. 20° 20' N.; Long. 123° 20'; the fleet hove to at 

 4£ p. m, in Lat. 19° 49'; N, Long. 123. 33. ; p.m. wind N. N.W. 5 p. m. N. W. ; 

 7 W. N. W. and W. b. N., and at midnight W. S. W. at 4^ p. m. fleet hove to 

 by signal, being then in Long. E, ; 11 p. m. Henry Addington'lost her rudder, 

 midnight blowing very heavy. 



At 3 a. m. The True Briton's Barometer sunk 2-10ths of an inch. It is 

 not said if all at once, or if this is the amount of fall since Noon of the 1st. It 

 is further said that " at Noon (2nd) it is down at 29. 3, but it is marked at the 

 foot of the log 29.5, and at 9 p. m. at 29.3, so that I presume 29.5 to have been 

 an error of the copyists, and that it really was at 29.3 at Noon and 29.43 at 3 

 a. m., or 2-10ths below Noon of the 1st. At midnight the Barometer is mark- 

 ed at*29.2. I shall refer again to this Barometer register in deducing the track 

 of this Cyclone. 



3rd July. — a. m. wind veering from W. S. W., to S. S. W. ; at 9 a.m. and 

 Noon, when Lat. 20° 5% N. ; Long. 123° 46' East. p. m. wind S. b. W. at 

 sunset and South at midnight, blowing very heavy to 4 p. m. when it moderat- 

 ed to midnight, after which the weather became fine. 



Remarks. 

 I commence these with the range of Capt. W. Stanley Clarke's 

 Barometer in the True Briton, to which I have before adverted. It 

 was at Noon 1st July, 29 63. Ther. 86^°. 



3 a. m. 2nd July, had fallen 0. 2., therefore, 29.43. 



Noon, 29.30. 



9 p. m.,. 29.30. 



Midnight, 29.20. 



3rd July, 3 a.m., 29.10. 



8 a.m., 29.15. 



1 1 a. m., 29.20. 



Noon, 29.30. 



Capt. Clarke adds : 



" In the other column I have noted the fall and nsa* of the Marine Barome- 

 ter, which proved a very true index of the weather, for between 3 and 4 o'clock 



* Shewing how new its application was at this time as a warning to seamen of 

 the approach of tempests. 



2 n 2 



