of shorter periods, ranging from Im to 2m-3m, generally began somewhat 

 later. This relation is illustrated by Fig. 2, where the time, T, is taken 

 as abscissa, and the distance, A , of the respective stations along the 

 path of the cyclone as ordinates, the origin of a corresponding to the 

 position of the cyclonic centre at 6 h. a.m., 1st April. 



The thick full line represents the course of the centre of the cyclone 

 or, in other words, the relation between the time T and the distance A 

 at the time when the centre of the cyclone attained the point nearest 



3000 



2500 



ZOOO 



\500~ 



1000 — 



500 p*^ 

 4001, ,,ii„ 



FiCz. 2. 



to the respective station. As seen from this curve, the travelling velocity 

 of the cyclone was at first small, at the middle stage somewhat large, and 

 later small again. From Aburatu to Hatinohe, however, this travelling 

 velocity is nearly constant and approximates 67 km. per hour. 



A 

 and 



The time points marked with 



correspond to the beginning 



and the end respectively of the conspicuous undulations of longer 

 periods (proper oscillations of bays), and the points marked with 



t 1 



I and I to the beginning and the end respectively of the conspicuous 



! \ 



undulations of shorter periods (very long swells). Moreover the marks 



I 



and represent the time of maximum amplitude of the undulations 



I 

 of longer and shorter periods respectively. 



