1845.] Fourteenth Memoir on the Law of Storms in India. 905 



Our first log to the Eastward is that of the Caledonia, which at noon 

 on the 29th, was in latitude 6° 50' North : longitude 88° 30' East.* By 

 midnight the weather was decidedly threatening, and the swell from the 

 SW. increasing, the barometer having fallen to 29*70, with afresh breeze 

 from South to SSE., going about seven and seven and a half knots. We 

 may fairly then assume, that she was now on the Eastern border of the 

 vortex, and taking the average wind at SbE., that it bore WbS. of her. 

 It will be noted that the Alibi was running up between the 28th and 

 29th to the Northward across the Caledonia s track, and experienced no 

 bad weather, though traces of the stormy action may be found in her 

 remarks. 



The Juliana on the 27th, seems evidently running up into the South- 

 western quadrant of a Storm Circle, (or into a segment of the forming 

 vortex ?) which by daylight of the 28th, had passed onwards, and was 

 veering and hauling gradually, like the broken streams of wind, of 

 which I have, in former Memoirs, supposed the existence, to SW. and 

 to SSE., SE. and Easterly, when it became another, and a different 

 storm, from the Caledonia's, as we shall presently shew. 



To estimate the centre on this day, the 29th, we have but its 

 bearing from the Caledonia. Its distance from her to the Westward I 

 estimate as follows : — 



We find that on the 30th, the Caledonia was at the true calm centre 

 of her hurricane in latitude 7° 0', longitude 85° 50' ; and that a little 

 after midnight between the 1st and 2nd, say at 1 p. m. of the 2nd, the 

 Hindoostan Steamer also, doubtless steaming through the centre of her 

 hurricane. Taking the Caledonia's hurricane and the Hindoostan s to be 

 the same ; this is from noon 30th to 1 a. m. of the 2nd, thirty- seven 

 hours, and the distance between the positions is 218 miles, which gives 

 5.9 miles an hour for the rate of travelling of the vortex, or 141.5 miles 

 per day. Now we find that the Caledonia in the twenty- four hours 

 from noon of the 29th, to noon of the 30th, had made 160 miles of run, 

 of which ninety miles were run from noon to midnight, and by 7 a. m. 

 she was obliged to lie to, and at 10, was on the verge of the calm 

 centre, in which at 11, she was fairly involved ; or say she had made the 



* Her position on the 28th, is marked from the memorandum before alluded to. 

 Nothing being said of the weather from noon 28th, to noon *29th, I presume it was fine, 

 and the track shews how the ship was running towards the hurricane. 



