724 Thirteenth Memoir on the Law of Storms in India. [No. 166. 



pleted at the nearest time and distance to which the log allows us to 

 calculate it. 



First, it appears then that from November 22nd to November 27th, 

 the Charles Heddle completed as follows : — 



1st Turn in 24 hours, running 387 Miles. 





1 





38 „ 



,, 



426 



,, 





1 





23 „ 



>> 



243 



»> 





1 





17 ,, 



>> 



167 



>> 





1 





15 „ 



>> 



150 



» 



Sums, 



5 turns in 



117 hours, 



»> 



1373 



Miles. 



Means are 



1 turn 



in 



23J hours, 



>> 



274| 



Miles. 



The average circle then was 274 3-, or say 275 miles in circumference, 

 which would give not quite 90 miles of diameter, and the Brig's average 

 distance from the centre, being the half of this, at about forty-five miles. 



Again, five turns of the circle are 160 points, which in 117 hours are 

 1 point and three-quarters in an hour, and the 1373 miles divided by 

 ,160 are 8-6 miles of distance for each course, or chord of each arc. 

 Taking every separate turn we have, 



1st Turn, 387 Miles of circumference, or 

 2nd „ 426 

 3rd „ 243 

 4th „ 167 

 5th „ 150 



Diameter. 



Distance from 

 the centre. 



123.3 



61.6 



135.5 



67.7 



77.3 



38.7 



53.2 



26.6 



47.7 



23.8 



437.0 



218.4 



Average, 



44.6 



Taking every separate half turn, which is suggested by the evident 

 tendency of the spirals, and choosing from the log each half circle from 

 WNW. to ENE. by compass,* and from ENE. to WNW. again, we 

 have first, 



* About, or W.g N. and E.5 S. true course, on an average. 



