Seiches in Some Lakes of Japan. 



83 



ialling water is slower than in the last case, and therefore the 

 iDclination of the carve becomes flatter; while on the contrary, 

 the inclination after low water h becomes steeper. The result of 

 this is that the point b is displaced toward the right, and the 

 •retardation for high water is made smaller than that for low water 



Fig. 23. 



{Fig. 23), of which the former gets larger and the latter gets smaller 

 till they are equal to each other, when the mean levels of the lake 

 and the sea are of the same height. 



Another point is worthy of attention. As the double ampli- 

 tude of the tide is about 1.5 metres on the sea shore, at low tide 

 the bed of the canal is higher than the level of the sea. The 

 ■connection of the lake and the sea is therefore not like that shown 

 in Fig. 21, but rather like that in Figs. 24^ and 246. 



Fig. 24a represents the condition when the level in the lake is 

 highest; and Fig 246 that when the level of the sea is lowest. 



