1849.] Eighteenth Memoir on the Law of Storms. 907 



these two causes I have found that, though with some of the ships the 

 rule would give tolerable results, yet with most it would place the 

 centre very much farther off than it really was ; it being thus, as before 

 announced, difficult if not impossible to judge of the distance of the 

 centre at less than 100 to 120 miles by the rate of fall. 



Diagram, No. IV. 



This diagram requires a brief notice. It is one on a scale double 

 that of the chart, of the tracks of the ship Collingwood running up on 

 the Eastern and North-Eastern quadrants of the Cyclone, and in fact 

 overrunning it on to a lee shore ! and losing her masts in doing so ; 

 and of the Futtle Rozack crossing in front and making a fair wind of it, 

 while it was dismasting the Washington Alston, Hope and other vessels 

 which left their pilots with her, or about the same time. On the differ- 

 ence between the management of these ships it is not necessary to 

 remark. 



The Barometers of both are marked at intervals of their track, and 

 shew how correctly they measure the approach to, or recession from 

 the centre, though not the actual distance from it. These two ships it 

 will be seen were passing each other at about 75 miles distance, and 

 on opposite sides of the Cyclone, both carrying what sail they could 

 shew, but at midnight 12th and 13th, the Collingwood, a first rate 

 English ship, with troops on board, was running in full career into the 

 very jaws of destruction, and the Futtle Rozack, a deeply laden rice 

 ship, and a poor sea boat, with a new lascar crew, making her way, as 

 surely as scientifically, into fine weather, without straining a rope yarn. 



The Lightning experienced in various parts of the Cyclone circles. 



It seemed of interest to know if we could in this Cyclone deduce 

 any views from the knowledge of this question. I find that exclusive 

 of the distant lightnings before the onset of the Cyclone, the different 

 ships noticed it within the Cyclone circles as follows : — 



Burham (7). — At midnight 13th, "much vivid lightning," but 

 during the strength of the Cyclone very little lightning; not more 

 than 3 or 4 flashes altogether, wind about South. 



Wellesley (8). — On 12th, 8 p. m. to 2 a. m. 13th vivid lightning and 

 peals of thunder, all round and close over the ship, wind West to S. W. 



