REPORT ON OCEANOGRAPHY 43 



ing the period 1949-53, including regular hydrographic observations, 

 observations of diurnal variations of several oceanographic elements, 

 observations in the estuaries. They have carried out four regular cruises 

 in Tokyo Bay during the period 1949-52 and occupied twelve stations in 

 each cruise, some of them involving measurement of internal waves, and 

 the test of self-recording current meter devised by T, Nan'niti. 



The observations in the Kuroshio area were made in two cruises 

 in the area south of Tokyo during 1952. Twenty stations have been 

 occupied in these cruises. Weathership Observations were made by 

 other divisions on board "Ryohu Maru", "Ukuru Maru", "Chikubu 

 Maru", "Shinnan Maru", and "Ikuna Maru", at the St. X (39°N 153°E) 

 all the year round, and at St. T (29 °N 135°E) in summer months. 

 Oceanographic observations were made on their courses to and from the 

 weather ship stations. 



Hakodate Marine Observatory, Hakodate, directed by Dr. Yoshi- 

 tada Takenouti, has made the oceanographic observations on board the 

 "Yushio Maru" every month. The exploring areas are chiefly the seas 

 to the NE of Japan, and sometimes off Hokkaido, the northern part 

 of Japan Sea, etc. The surface observations were made in the Tsugaru 

 Straits on board the liners three times a month. 



Maizuru Marine Observatory, Maizuru, directed by Hideo Kawa- 

 saki, has made observations on board the "Kuroshio Maru" in Wakasa 

 Bay, Maizuru Bay, and surrounding areas about three times a month 

 since November 1949. 



Kobe Marine Observatory, Kobe, directed by Dr. Yasuo Matsun- 

 daira, has made the oceanographic observations in Osaka Bay, Kii Suido, 

 etc., with the M.S. "Shunpu Maru". In addition current observations 

 have been carried out. 



Nagasaki Marine Observatory, Nagasaki, directed by Dr. Kazuhiko 

 Terada, has carried out the oceanographic observations in the adjacent 

 seas with the Research Ship "Umikaze Maru" and surface observations 

 have been made on board the liners connecting Nagasaki and the Goto 

 Islands. Special attention has been paid to the observation in the areas 

 west of Kyushu including the shallow areas bordered by numerous islets 

 in the regions. They are also planning to observe the seiches or station- 

 ary oscillations in Nagasaki Harbor which sometimes cause damages to 

 the shore with the enormous amplitudes. This observatory is also active 

 in the forecasting of the wind waves and the meteorological tides. 



There are several coastal meteorological observatories which have 

 surveying ships. M.S. "Koshi Maru" of the Niigata Local Meteorolog- 

 ical Observatory, M.S. "Oyashio Maru" of the Hachinohe Meteorological 

 Observatory, etc., have made the oceanographic observations offshore. 



