Seiches in Some Lakes of Japan. Ji]' 



When the mean depth is calculated with '. . ' ' *, 



we find that 



//,„ = 2499.3 cm., 



so that 



V1k^= 49.99, 

 r = 14.02™ 



(3) When h is plotted on section paper and /(,„ is determined 

 by using a planimeter, it is found that 



/i,„ = 2414.7 C7n., . ' . 



Vk:= 49.14, 

 T = "14.29™. "^ 



(4) When the mean value of V~/r is calculated witli . . 



(V /t h= — ^r^ — , 



we find that 



(Vir> -49.32, ■ 

 T =14.18"'. 



(5) When Vli^ is plotted, and its mean value is determined 

 with a planimeter, we have 



(V^)„-48.60 

 T =14.31'". 



(6) When- the mean value of the reciprocal of V h is 

 calculated with 





a/ ll ^'« (33 



