1850.] Nineteenth Memoir on the Law of Storms, 383 



23rd, the centre of the Braemar' s Cyclone is about 100 miles to the 

 South of the Jumna's probable position at the same time. And this 

 too serves to shew that, like the Jumna's Cyclone, that of the Braemar 

 was also of small extent, for had it been large it would have reached 

 the Jumna at this time with its northern quadrants, giving her a 

 N. Westerly gale of the same force ; and that at noon of the 22nd 

 the Jumna could not have been far from its centre if it had existed ; 

 whereas we find that she had at that time Northerly and variable 

 winds (force 6) with cloudy weather, and it was not until 15 hours 

 afterwards 3a.m, 23rd, that it " came on to blow." 



There can be no doubt, also, that the Braemar' s Cyclone travelled 

 down nearly with her, i. e. from the N. N. E. to the S. S. W. ; for as 

 from noon to midnight of the 22nd, she made a chord of 95 miles this 

 would have given her a very considerable veering of the wind had the 

 Cyclone been coming direct towards her.* 



At 8 a. m. there is the remarkable note in the Braemar' s Log of 

 " gale suddenly increasing," and the Barometer had fallen at Noon to 

 29.45, from 29.58 at midnight ; and we find that at 9 A. m. the wind 

 with the Jumna veered from W. N. W. to N. N. W. increasing in 

 strength from 9 to 10. We may take this, I think, to be about the 

 time of junction of the two, or of the three Cyclones, as that of the 

 Jumna now seems to have adopted a steady course to the Southward 

 as if it had been before attracted and repelled between the Sultany's 

 and the Braemar' s, which accounts for its serpentine track as shewn 

 in our diagram. The land whirlwinds and simoons certainly make 

 tracks of this kind, and in hail storms and thunder storms clouds are 

 sometimes seen attracted and repelled between two others. So that 

 on the supposition that the Cyclone is an electrical phsenomenon, there 

 is nothing at all strange in this track of the Jumna's, and we may 

 think ourselves very fortunate that we have so many Logs and notices 

 to explain it. 



The main Cyclone evidently after this time, (Noon 23rd) passed to 

 the Northward of the Braemar; which ship was probably carried 



* A Cyclone of 100 miles in diameter requires in round numbers a run of 10 

 miles for each point which the wind veers ; one of 200 miles about 20', so that the 

 Braemar's Cyclone could only be travelling parallel to her, and at about her own 

 rate. 



3 d 2 



