1048 Third Memoir with reference ta [No. 106. 



upon the very imperfect statement which has reached me, and this writ- 

 ten by the clerk of a commercial house, who was probably not a seaman. 



I have then taken the Freak's and Flowers of Ugie^s positions, to 

 determine the place of the centre this day, particularly the last ves- 

 sel's, as there can be, but little doubt of her position, as she was going 

 free till the time she hove to ; and the logs of both vessels are excel- 

 lent. The Tenasserim and Nusserath Shaw are apparently out of 

 the actual circle of the storm on this day. They were perhaps be- 

 ginning to feel the monsoon, which as I shall subsequently show was 

 making its way rapidly up the Bay. 



For the centre of the ZOth April. We find that according to Mr. 

 Ewart's very graphic letter, the shift of wind took place at Pooree (Jug- 

 gurnath) between 7^ p.m. and 9^ p.m., so that we may take the centre to 

 have passed that station at 8^ p.m. of the ZOth. From noon of the 29th 

 to 8 J P.M. of the ZOth is 32^ hours, and the distance from the centre 

 of the hurricane on the 29th to Pooree, is about 165 miles. Throw- 

 ing away fractions, this is about 5. 1 . per hour, and assuming the storm to 

 have travelled in a straight line, we find upon measuring back for these 8 J 

 hours, that the centre at Noon falls about 40 to 45 miles to the SW. of 

 Pooree. Tliis also agrees with the log of La Belle Alliance, which vessel 

 had the shift of wind— and she probably passed through, or close to the 

 centre, — at 1 1 a.m. This position of the centre would give the wind at 

 the station of Pooree NEbE. Mr. E wart's letter says NE., but a dis- 

 crepancy of a point might occur even to a seaman ; where compasses, 

 weather- cocks, and vanes were not, we suppose, abundant ; and where 

 the tempest was also a sand-storm. To the North, we find the Chris- 

 topher Rawson with the wind marked at SE. at daylight, and SSE. 

 in the afternoon, but we have no statement of the wind exactly at 

 noon, and in the state she is described, her observation of latitude 

 must have been but a very indifferent one. Her place in the circle 

 would give the wind to have been about SEbS., so that there is with 

 her, also, a difference of a point, or a point and a half, only. The logs of 

 the Flowers of Ugie with a gale at South, and Vectis, a gale at SbW. 

 differ widely from what they should have been had the circles of the 

 vortex extended so far as their positions. I have marked them on the 

 diagrams, and now proceed to consider the probable cause of this discre- 

 pancy, and of that which we observe in the logs of the Pilot and Light 



