Seictes in Some Lakes of Japan. 



61 



DE, where x is measured both ways from D. Then the depths at 

 A, C, E require 



Pi=ai 



" ='<i-t)=Ki-t) 



2^2 ■"" ^2 J 



which determine «i', «i, «2, «2 completely. The displacements for 

 the segment AB are 



-~^iA,'J,(w,')+B,'Y,{zü,')\sin n(t-T,') 



The boundary condition at A, or at w^' =0, is that ^ = always 



.-. A,'JiO)+B,'Y,{0)=0 



or 



A,' Y,iO)' 



but as Lim,,^o Y(w) ~^' ^^® ^^^® B/=0. Therefore for points 

 lying between AB, Ave have 



A,' 



%D- 



—Ji{wi)sin n(t—Ti') 



^ = '^^i' A ,'Jo(io,')s{n n (t - r/) 



(1) 



At B, where 



w,'=-—^=na^' say, 

 Vgh, 



