Ship Waves. 13 
suitable integration. Consider, for instance, the usual form of model which 
consists of a parallel middle body with a curved entrance extending from the 
fore-shoulder to the bow and a curved run extending from the aft-shoulder to 
the stern. In the sense in which the term has been used here, the total eleva- 
tion can always be separated into parts localised at these four points, the bow 
and stern and the shoulders. This can readily be expressed analytically by 
suitable manipulation of (28) and (35); but it is hardly worth while pursuing 
the general analysis further, as it is simpler to work out the results directly 
for any particular form of model, 
359 
