432 MR. T. HEELIS ON THE HEIGHT ETC. OF WAVES 



coincide within the limits of the ship^s motion during their 

 passage. 



This being premised, the following comparisons of wave- 

 magnitndes, and estimations of their speeds_, although few 

 in number, may not be without interest. 



All the observations here mentioned were made during 

 moderate or strong gales of wind. 



The comparisons are arranged in three columns or lines, 

 one under the other, the uppermost one containing the 

 highest waves observed, with their altitudes when recorded, 

 the second those of medium height, and the third the 

 small ones. The numbers indicate the order of the waves 

 in the series observed ; so that the whole will be in the 

 nature of a rough curve. 



13th July 1862. 



1st Set. 



Latitude 35° 33' S.; longitude 22° d E. 

 Large... i (25 feet), 11, 12, 14, 15, 16. 



Medium 5, 6, 



Small... 2, 3, 4, 7, 8, 9, 10, 13, 







2nd Set. 



Large ... i , 



7. 



12, 



Medium 6, 







Small... 2, 3, 4, 5, 





8, 9, 10, II, 



3rd Set. 



Large... i, 





12. 



Medium 5, 







Small... 2. 3, 4, 6, 



7. 



8, 9, 10. 11, 



4th Set. 



Large... i, 2 (very large), 6, 7, 24, 25. 



Medium 3» 4) 5> 



Small .. 8, 9, lo, II. 12-23, 



5th Set. 

 Large... i, 2, 17-20, 



Medium 6, 9, 



Small... 3,4, 5, 7, 8, 10. II, 12. 13, 14, 15, 16. 21-24. 



