10 
The scale is not sufficient to show the variations in the 
first part of the curve, but one may notice the short interval 
between c=2 and c=8 for which n drops to values in the 
vicinity of 2; after this the index rises again. The region 
of low values of n depends upon the relation of wave power 
to frictional horsepower; hence it will vary not only with 
the lines of the ship but also with its absolute dimensions. 
This, together with other points mentioned in the previous 
study, must be left to a more detailed analysis and com- 
parison of experimental results for models of different types. 
68 
