546 A Twenty-third Memoir on the Law of Storms. [No. G. 



it a rate of travelling of 7.3 per hour on the 21st and 22nd, so that 

 its progress was, as usual, somewhat retarded by the land. 



The Diameter oe the Calm Centre. — This is always an element 

 of much interest where we can obtain any approximation to it. And 

 in this Cyclone we have a very good one, for we have seen above that 

 the rate of travelling between Ealse Point and Kedgeree Light 

 Houses was 5.4 per hour, and we learn from Mr. Barckley's capi- 

 tal report that it fell " stark calm" at 7h. 30', and that it was blow- 

 ing a complete hurricane at 9h. 30' a. m. of the 22nd ; and as the 

 actual centre passed somewhat to the "Westward of the Light House 

 p. 543 we may take 2 hours at 5.4, or ten miles eight- tenths, or say 

 in round numbers eleven miles as the diameter of the centre there 

 on that day ; but on the 23rd at Kedgeree, it seems to have much 

 diminished as the calm interval there was not more than half an hour, 

 which would give but 2f miles for the diameter of the centre ; and 

 with the Megna off Mud Point, at the N. West extremity of Saugor 

 Island, though the centre must have passed very close to the S. East 

 of her (shift from E. S. E. to N. N. E.) it moderated only for a 

 very short interval. "With the Hope, Light Vessel off the S. "W. 

 part of Saugor Island, no calm occurred. The American ship Stwgis 

 in Saugor Roads while the centre was passing her, had the wind 

 veering from E. N. E. to South and a slight lull " for a few 

 moments," is afterwards noticed at 6 a. m. but this was no part of 

 the centre, and it is evident that on this day, there was no extensive 

 calm space at the centre. 



The Portsmouth's Log and Protest. 



I obtained through the attention of Chas. Huffnagle, Esq. Ame- 

 rican Consul at Calcutta, a copy of the Protest and an extract from 

 the Log of the American Ship Portsmouth of New York ; but there 

 are unfortunately so many discrepancies between them, and again 

 between these and the newspaper report, that as regards the ship's 

 exact position, and even the dates, I am wholly unable to reconcile 

 them without the most arbitrary and unwarrantable changes, and 

 unfortunately again, I could not obtain a sight or copy of the ship's 

 detailed log, nor a comparison for her Barometer, so that for tracking 

 the Cyclone, they are quite useless. 



