Cr/2b 
Ship Waves 421 
In fig. 2 of that paper, the full curves are calculated from the usual 
theory, that is, for @ = 1 in the notation of the present paper; while 
the dotted curves are observed values. It may be concluded that the 
value 8 = 0-6 is of the right order of magnitude to bring the calculated 
values into better agreement with observed values, at least for medium 
values of c/,/(gl). It should be noted that Wigley’s model is slightly 
different from that of the present calculation, in that it has a certain 
amount of parallel middle body inserted between the parabolic ends. 
c/V(gl)=0:577 
x/L 
Fic. | 
For that, and other obvious reasons, it is not worth while attempting any 
closer comparison of the results meantime. 
4. It is of interest to examine the corresponding change in the wave 
resistance for this model. It can easily be deduced from (6) that the 
wave pattern at a great distance to the rear of the model approximates. to 
C=— a {p* sin (x — J, y) — (2 — 8) pcos 8 cos (x — J, y) 
Tp —7/2 
— 2(1 — 8) cos? 0 sin (x — J, y) + 2(1 — 8B) cos? 0 sin (x, y) 
+ Bp? sin (x + J, y) + Bp cos 8 cos (x + J, y)} 8, (15) 
402 
