44 Art. 7. — S. Hirayama. 



ABURATSUBO. 



Long. 139° 37' E., Lat. 35° 10' N. 



This observatory is also one of the permanent observatories 

 and is located on a shallow inlet, very near to the Marine Zoologi- 

 cal Station of the Tokyo Imperial University. The accompanying 

 map shows the position of the observatory. At first, the present 

 building and tlie tide-gauge Avere located at Inubo, where there is 

 a lighthouse. One year'a experience there was a failure, since 

 the pipe was very frequently choked and registrations could not 

 performed regularly. It was therefore decided to move the entire 

 observatory to the present site in the Miura Peninsula. The first 

 registi^ation here was made on June 11th, 1894. Since then the 

 registration has gone on continuousl}^, without receiving any 

 serious break. 



The series to Avhich the reduction Avas applied are those 

 obtained in the years 1895, 1896, 1897, 1898 and 1904. The 

 harmonic constants are given in the accompanying table. 



The highest high-water recorded here Avas 2.77, referred to 

 the zero-point of the instrument, and occurred on October 10, 

 1904. The loAvest low-Avater recorded was 4.83, referred to the 

 same origin, and occurred on February 1 of the same year. Thus 

 the extreme range is 2.06 metres. 



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

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



m 



1895 3.668 



1896 3.679 



1897 3.638 



1898 3.650 



1904 3.634 



