684 A Sixth Memoir on the Law of Storms in India. [No. 127. 



The small dotted circle B., surrounded by the storm arrows, is supposed 

 to indicate the position of the centre of the storm at the time the Raleigh 

 was overset; and the position of the latter should be marked somewhat 

 nearer this circle, according to the latitude and longitude of the Raleigh on 

 the 5th, which Col. R,eid has given in her long. The course of the 

 storm appears to have been N. 72° W., and its centre is supposed to have 

 been opposite the Raleigh, about 8h. 20m. a. m. on the 5th; but this cannot 

 be ascertained with precision, as the indications of the Barometer do not 

 appear to have been closely watched and recorded during this terrific 

 period of the storm. 



Having shewn the rotatory character of these tempests, I consider the 

 depression of the Barometer which attends them, as being due to the 

 rotative action ; and the point of greatest depression as indicating the 

 true centre or axis of the storm. From the evidence now before us, we 

 arrive at the following facts : — 



1. That the Raleigh met a gale which set in with the wind at N., veering 

 round by the E. to E. S. and South. 



2. That at the harbours and roads " inside," (Macao, Kum-sing-moon, &c.) 

 as well as at Canton, the gale occurred at a later period ; and the wind 

 also set in at North, and veered to E. and S. E., in a manner similar to that 

 reported by the Raleigh. 



3. That with the ship Lady Hayes, off the islands near Macao, the wind 

 also set in at North; but the ship steering S. E. by E. under a press of 

 sail (and doubtless falling off with the heavy sea from Eastward) and 

 wind, towards the middle of the gale, began to veer towards the West, 

 whence it drew round to South towards the close of the gale. 



4. That the violence of the wind was apparently greater with the 

 Raleigh, than with the Lady Hayes. 



5. That the gale was experienced by an English Schooner, August 5th, 

 in latitude 18° 2' N., longitude, 15° 50' E. ; but the Levant arriving on the 

 7th in her course through the China sea, did not encounter the gale. 



6. That the fall and rise of the Barometer at Macao and with the 

 Raleigh, and the strength and changes of wind with the latter, w r ere such 

 as are often exhibited near the centre of a hurricane ; and that the minimum 

 depression of the Barometer occurred about seventeen hours later at Macao 

 than with the Raleigh. 



These facts seem to establish the following conclusions : — 



1. That the tyfoon advanced in a Westerly direction. 



2. Negatively — that it did not pass through the China sea, from N. E. 

 to S. W., nor on the opposite of this course. 



3. That it was a, progressive whirlwind storm, turning to the left, round its 

 axis of rotation. 



4. That its centre of rotation passed to the Northward of the Lady 

 Hayes, and to the Southward of the Raleigh and of Canton, and the an 





