Seiches in. Some La'îeè of Japan. 



9» 



Appendix. Seiches in a Small Pond. 



There is a small pond within the grounds of the Imperial 

 University of Tokyo. During July 1904, one of the authors with 

 Mr. T. Terada succeeded in recording two different motions of the 

 pond. As it is of interest to see that there is a natural seiche in 

 such a small mass of water, the general result then obtained is here 

 given. The pond is irregular in form and has a small island in it, 

 but its general contour is quadrilateral with diagonals about 90' 

 metres long. The sounding were made by us, and the result is 

 given in Fig. 28. The curves recorded on the 14th of July 1904- 

 are also reproduced in Fig. 29. 



The periods observed at three stations situated at the north- 

 eastern, southeastern, and northeastern corners of the pond 

 were: — 



Fig. 28. 



