Falttnsen 
slenderness parameter. It is a measure of 
the transverse dimensions of the ship com- 
pared with the longitudinal dimensions of 
the ship. 
C(x, y, 6) free-surface displacement 
6 angular coordinate used in the chapter : 
"Numerical Calculations'(see Figure 2). 
6 = 0 isa point on the centerplane. 
x wave length of the incoming wave. 
fictitious (Rayleigh) viscosity. (Note that 
LM 
K (arg) has another meaning. ) 
2 
w PA 
v _ 9 = 
8 d 
p density of water (mass per unit volume). 
i( wt - vx) , : 5 : : 
a(x)e source density per unit length in line dis- 
tribution of sources. 
foe} 
-ikx : 
a *(k) = fp dxe a(x) (the sign * means 
-00 here inverse Fourier 
transform). 
wU 
a = ea al 
g 
¢ (x, y; z, t) velocity potential in forward-speed problem 
and in zero-speed problem.” 
$ (x, We os By velocity potential of the incoming wave. 
op (* y, Z, t) velocity potential of the diffracted wave. 
(x, y, Zz) (1/U)* perturbation-velocity potential in 
steady motion problem. 
* Note, however, that in Chapter V ''Numerical calculations", it 
means the time dependent part of the velocity potential. 
1810 
