Harmonie Analysis of Tidal Observations. 21 



KIIRÜN. 



Long. 121° 45' E., Lat. 25° 9' N. 



As one of the permanent observatories in the island of 

 Formosa, it is placed on the western side of Sharyo-To, an islet 

 at the mouth of the harbour of Kiirun. This observatory was 

 originally established by the government of Formosa, and was 

 afterwards transferred to the Land Survey Department. 



The instrument here used is also Thomson' s tide-gauge. 



The first registration took place on May 13, 1904, and the 

 recording has gone on continuously since that date. The harmonic 

 analysis is applied to the series obtained in the years 1905, 1906 

 and 1907. 



The highest high-water recorded was 2.19, referred to the 

 zero-point of the instrument, and occurred on November 13, 1906. 

 The lowest low-water was 4.00, referred to the same origin, and 

 occurred on January 1, 1908. Thus the extreme range of tlje 

 tides is 1.81 metres. 



The height of the mean sea-level, based on the marigrams 

 obtained in each year, is derived as follows, the values being re- 

 ferred to the zero-point of the instrument : — 



1905 3.099 



1906 3.048 



1907 3.047 



1908 3.040 



