24 Art. 7.— S. Hirayama. 



F U K A B R I. 



Long. 129° 49' E., Lat. 32° 41' N. 



This is one of the permanent observatories belonging to the 

 Land Survey Department of the Army and is located on the 

 western coast of the island of Kyushu, not very far from the port 

 of Nagasaki. The coast line in this region is very irregular and 

 forms a bay, which has the city of Nagasaki at its head. The 

 observatory is not in the bay itself, but as there are many islands 

 almost closing the mouth of the bay, the sea about the observatory 

 makes a channel. 



The first observatory was established very near the present 

 location and from June 1, 1891, to January 1, 1895, continuous 

 registration was tried, but as the pipe was very frequently choked 

 with mud, it was thought that the marigram obtained there 

 probably did not represent the true state of the sea-level. 



The building was therefore moved to the present site and the 

 first registration at it took place on April 1, 1895, and since then 

 continuous work has gone on without great hindrance. 



We have measured the new series only, and the harmonic 

 constants obtained from the series of the marigrams of 1897, 1898, 

 1899, 1901, and 1905, are gathered in the present report. 



The highest high-water recorded here was 2.17, referred to 

 the zero-point of the instrument, and occurred on September 2, 

 1905. The lowest low-water recorded was 6.23, referred to the 

 same origin, and occurred on March 30, 1900. Thus the extreme 

 range is 4.06 metres. 



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

 ment, results us follows from each year-series: — 



