1845.] Thirteenth Memoir on the Law of Storms in India. 



725 



Hours. Miles. 



Circle 

 of 



1st turn 22nd 



/ 1st 

 \2nc 



half circle. 14 



23rd 



4. 



5. 



2nd 



r ist 



\2nd 

 f24th "1 1st 

 > and )> 

 I 25th J 2nd 

 f25th ] 1st 

 <{ and } 

 1 26th J 2nd 

 f 1st 

 ' ' * ' \ 2nd 



19 

 12 



11 



6 

 11 



167 334 

 228 456 

 127 254 

 246 492 

 103 206 



111 222 

 60 120 



100 200 

 55 110 

 80 160 







Distance 



ean. 



Diamr. 



from the 

 centre. 



395 



125.5 



62.7 



373 



119. 



59.5 



214 68. 



160 51. 



135 43. 



34. 



25.5 



22.5 



204.2 



Averaging, 4 1 . 



This table gives us then the daily and the average diameters of the 

 circle sailed round on different days from North to South, or thereabouts. 

 The following is the result when we begin with the time (8 p. m. 22d,) 

 at which the vessel was running about North (NNE. by compass) and 

 is thus a measurement from East to West ; or at right angles to the 

 preceding one. 





Hours. 





Circle 

 of 



Diameter. Dist. from 

 centre. 



. . rp, f 1st half circle. 

 1st Turn, | 2nd 



17 — 2041 



18 — 202/ 



406 



.. 129.2 .. 64.6 



2d Tu ™'{ 2 nd 





19 — 213\ 

 13!_148.5/ db1 - 5 



.. 115.0 .. 57.5 



3d Turn, { }* 





11 — 112 i 



8 — 81/ 



193 



61.4 .. 30.7 



4th Tura ' } 2nd 





10 — 96\ 

 6 — 60/ 



156 



49.6 .. 24.8 



5th Turn, { ^ 





8 — 80 1 

 8 — *80/ 



160 



50.0 .. 25.0 





202.6 



40.5 

 The above averages it will be noted are derived from the run by Log. 



There is a third average to be derived from the measurement, on the 



Diagram, of the distance between the parallels nearest to the longest, 



or vertical, or North and South diameters of each spiral on Fig II, 



which are those nearest the meridians. The transverse (minor) or East 



* This is incomplete : the log of the 27th closing, as before noted, at a West course, 

 and the weather becoming fine ; I have therefore supposed the latter half of the circle. 



