1849.] Eighteenth Memoir on the Law of Storms. 841 



IQth Oct. a. m. — Wind variable from North to W. N. W. with heavy squalls 

 of wind at intervals. At 4 a. m. heavy squalls from the northward, rising with 

 heavy black clouds. At 6, increasing to a steady heavy gale at west, with thick 

 dark weather and incessant rain ; making all preparations. Bar. at 1 a. m. 29.60 ; 

 at 2, 29.59 ; at 3, 29.57 ; at 4, 29.55 ; at 5, 29.52 ; at 6, 29.50 ; at 9, 29.50 ; 

 and at noon 29.50. 10 a. m. wind W. b. S. ; noon W. S. W. Lat. Acct. 16° 

 37'; Long. Acct. 38° 38' E. ; wind very steady ;set the reefed foresail. Course 

 steered, North, p. m. wind W. S. W. No rain but thick dark cloudy weather 

 and blowing a steady heavy gale. 6 p.m. gale increasing with violent squalls 

 of wind and rain. At 8 p. m. in Lat. 17° 17' N. ; Long. 88° 35' East, by 

 Acct. finding the Barometer rapidly falling, squalls rapidly increasing in strength 

 and the weather shewing every appearance of becoming worse> hove to at 9 ; wind 

 S. W. b. W. ; squalls terrific; at 10, worse, with vivid flashes of lightning and 

 heavy thunder, apparently very close. Midnight blowing furiously ; wind S. W. 

 with a continuation of heavy thunder and lightning. Barometer at 1 p. m. 

 29.50; at 4, 29.45; at 6, 29.40; at 7, 29.38; at 8, 29.33; at 9, 29.30 ; at 

 10, 29.27; at 11, 29.25; and at midnight 29.20. Capt. Harris considers that 

 he had the heaviest weather from 10 to 11 p. m. 



13th Oct.— a. m. wind South ; 3 a. m. S. b. E. ; at 4, S. S. E. ; at 6, S. E. ; 

 at 8, S. S. E. ; and at 11, South. From 1 to 4 a. m. a heavy gale with rapid 

 gusts of wind, sea rising fast. At 4, gusts decreasing in strength to a hard gale 

 but with a high confused sea ; by 8, wind rapidly abating. Noon moderate Lat. 

 by Acct. (and nearly correct) 17° 38' N. ; Long. 88° 33'. Bar. at 1 a. m. 

 29.20; at 2, 29.17; at 3, 29.10; at 4, 29.20; at 5,29.22; at 6, 29.22; at 7, 

 29.30 ; at 8, 29.35 ; at 10, 29.36 ; and at noon 29.40. 



I have placed this ship in the chart as her run and drift are given, 

 but Capt. Harris states that he had no solar observations for two days 

 previous to the 12th, and in such weather star observations cannot be 

 much depended upon. She was, I have no doubt, farther to the East- 

 ward than she supposes on the 12th, probably about half way between 

 the positions of the Barham and Sea Park, which would then give her 

 the winds she experienced as the Cyclone moved on and lifted up to 

 make way for the monsoon below it. (See summary.) The Cyclone 

 track also may have curved to the westward at first, for it seems certain 

 that the tornadoes move in waving or oscillating lines, though the aver- 

 age is a straight track, and from analogy we may suppose the Cyclones 

 to do the same. 



5 Q 



