1840.] the Theory of the Law of Storms. 435 



it for that day; in say 13 d 30' N. and 92° E. The SE. wind experi- 

 enced by the " Duke of Bedford" is scarcely an anomaly, because of her 

 proximity to the Andaman Islands ; the mountains of which, being 

 some of them 2000 feet high, may have operated, as all high ranges of 

 land seem to do, by deflecting the winds into a different course. I have 

 therefore rejected her log for that day. The " Cashmere Merchant" 

 seems also out of the influence of the vortex, and too near the coast of 

 Tenassarim. The centre, if there was one, might have been further 

 north or south, but I have preferred placing it nearly on a line with 

 the general direction of the tempest on the following day. Could we 

 have obtained from these ships a single observation when in Calcutta, 

 so as to test the accuracy of their barometers by a standard, these ob- 

 servations would have been far more valuable ; but as I have before ob- 

 served p. 420, 1 could only obtain this in one instance out of about thirty 

 applications made, while collecting information for the present memoir. 

 2. On the 13th we find the circle in some degree formed, for we 

 have, as will be seen by the Diagram No. II, and tables 

 Wind. 

 The Ganges, .... ENE. . . Hard gale, high sea, 

 The Bedford, ... ESE. .. Heavy squalls and Bar. falling, 



Balguerie, SW. . . Blowing strong, sea rising, 



and with their positions on the chart, this will give the centre of the 

 vortex, if there was one, about where I have placed it, in lat. 13 3 42' N. 

 long. 89° 47' E. 



The "Sumatra" seems to have run out of the influence of the 

 vortex to the northward, and having no barometer, we cannot refer to 

 its height. The storm can scarcely be said on this day to have reached 

 the "Arethusa," " Ripley," and "Kosalind." 



It is worth noticing, that the three ships first mentioned had all been 

 running towards this point from noon of the 12th, and the changes of 

 wind which they had since that date are exactly such as ought to 

 occur if a vortex had been forming, moving onward in the direction 

 laid down, and they had been running into it. 

 We have for the Barometers, that of— 



The Ganges, 29.00 at 6 p. m. at which time she was about 



on the meridian of the centre. 

 The Bedford, . . 29.90, being 00.10 higher than on the 12th, the 

 centre having passed her. 



3 K 



