but the first order terms must have the dimensions of a length, and so 
a = ¢/k is used in the various solutions that are obtained. The parameter 
€ never appears explicitly. 
See, for example, Longuet-Higgins [1953], 
and Pierson and Fife [1961] for different ways that e can be interpreted. 
(5) 
(6) 
(7) 
ne 72 
x=atex, te Xo 
(4 
Yah cheery iia Yo 
2 
z=6+tez +e Z5 
2 
PiSPR ae PO) cD iece Po) 
2 
eS Elance amcce F, 
The equations in ¢ become 
| 
(>) 
cee teeta Pig ® = 
| 
oO 
Viena Sie Sip! © = 
ane, ig yale w 
ar + 2) = (0) 
lat’ Yipt bt 
dF) = x), da + ¥ 148° + Zz), 06 
The equations in ¢ become 
Fe EZ et Poe O aeee er a me tp que St tt ola 
Yatt + 8228p * Pog/P = —*i1te*18 ~ Yite Yip ~ Zitt71p 
Zou, +t B26 + Pog! P = - X1e¢*15 7 ite 16 ~ Z1tt 216 
Palm Zeb nec on iGealian sslamlors Uipic low tlauls 
Gk 
ma | 
*ot 
= ZeOila yap lalate aes 
+ + 
PeSeana  Uieeia” Sie ieleney Dine sss) 5 
+ (25, + Z1,Y16 * YieYis © 1 215)% 
are ni sieei6 ae 
