44 



S. Nakamura and K. Honda : 



pliotographically so that they may have the same scale for time in 

 order to facilitate the comparison. The motion in question was 

 clearly in just opposite phases. Further by making use of 



j_i. 



20" 



30' 



Fiff. 10. 



SO 



oil 



bathymétrie data and the theoretical formula for the calculation of 

 the period, it will be shown further on, that the period 15.38 

 belongs to the uninodal seiches. 



The second oscillation with a period of Ta=6.8 minutes must 

 be the binodal seiche. For, comparing the times of high water for 

 it, we found that Hakonc and Hotokegasaki were in opposite 

 phases, Hakoné and Motohakoné in the same phase, and Hakoné 

 and Takogawa again in opposite phases. 



