Harmonic Analysis of Tidal Obsjrvations. 37 



KUSHIMOTO. 



Long. 135° 46' E., Lat. 33° 28' N. 



This observatory was founded in the year 1891, as one of 

 the permanent observatories of the Land Survey Department, on 

 eastern side of the mouth of Kii Channeh As will be seen from 

 the accompanying map, its location is in a very small bay near the 

 neck of a peninsula. The water is not deep and its mean depth 

 was found to be 5.0 in. and its 1.3 km length, according to Drs. 

 Honda and Terada and others. 



The first registration of the tides, took place on May 21st, 



1898. From that date the work was continued for about four 

 years, but during this interval the tube was very frequently choked. 

 Thus, the entire observatory was moved a little furtlier from the 

 old location. Tlie former series being closed on March 5, 1898, 

 the new series was begun on May 21st of the same year. This 

 observatory is near the pretty large town of Kushimoto, and 

 presumably there is no great difficulty in obtaining the correct 

 time. 



The marigrams to which our reductions were applied are 

 entirely of the new series and the four series obtained in the years 

 1897, 1898, 1899 and 1904 are now reported below. 



The highest high-water recorded here was 2.32, referred to 

 the zero-point of the instrument, and occurred on September 28, 



1899. The lowest low-water recorded was 6.16, referred to the 

 same origin, and occurred on December 24, 1897. Thus the ex- 

 treme range is 2.84 metres. 



The height of the mean sea-level, referred to the zero-point 

 of the instrument, is obtained for each year-series as follows: — 



