and current drags set adrift in Suruga Bay, showing a counter-clockwise 

 circulation in the bay induced by the Kuroshio water mass. He also 

 determined the current system in this bay from the drift of set-nets. 



In 1947 K. Kimura made an interpretation of the formation of 

 isolated cold-water masses to the southern coasts of this country. 



Yasukazu Saito, a young research member working with Kimura, 

 also determined the movement of water in the Tsusima Current from 

 the result of drift-bottle experiments. He also pubhshed a theoretical 

 research on the wind currents in limited seas, and the oscillations of 

 lake water induced by winds. I. Yamanaka, working also with Kimura, 

 published a report on the remarkable fluctuations of water temperature 

 in To3'ama Bay in the autumnal season. 



In the Government Fisheries Institute, Professor M. Okada published 

 some remarks on the use of isopycnal charts for calculating ocean currents. 

 He also published a method of determining the currents in the sea, 

 using the principle of continuity of water volume, salinity, and other 

 properties of sea-water. He was an eminent theoretical investigator on 

 the dynamical oceanography, , but unfortunately Okada died in 1941 at 

 the age of thirty-nine years. 



Activities in the Kobe Marine Observatory 



Since the Kobe Marine Observatory was established nearly thirty 

 years ago, and has long tradition and numerous contributions to the 

 science of the sea, it appears to the compiler natural to describe its 

 activities separately from those of the other agencies subordinate to the 

 Director of the Central Meteorological Observatory. 



The practical studies on ocean waves have been made by Koji Hidaka, 

 Z. Yasui, and collaborators from 1937 on, the results being published 

 from time to time. In 1939 Hidaka published the results of study of 

 ocean waves and swells by the steieophotogrammetric survey, using a 

 pair of cameras specially mounted on 6-metre base-line. The survey was 

 made at several parts of the Pacific Ocean in the past four years. He 

 deduced some empirical formulas with respect to the relations between 

 winds and waves from the result of this survey. 



In 1939 K. Koenuma published his extensive studies on the Kuroshio, 

 the Japan Current, chiefly consisting of water mass analysis and dis- 

 cussion of the hydrography of this current. This paper was afterwards 

 succeeded by a series of important papers on the hydrograph\' of the 

 western North Pacific. 



In 1939 K. Hidaka discussed how to select the layers of observations 

 in hydrographical surveys, and showed that the number of layers of 

 observation must be increased in depths shallower than 100 m. This 

 year he proposed a method of calculating the absolute velocity in 

 dynamical calculation given by Bjerknes, use being made of the continuit}^ 

 of water volume and of salinit3^ 



In 1941 Z. Yasui computed the annual variation of water temperature 

 and density along the coasts of Japan, and computed the amplitudes 

 and phases for them. 



In March, 1942, K. Hidaka left the Kobe Marine Observatory and was 

 transferred to the Tokyo University as a professor of Physical Oceano- 

 graphy. The then Director Horiguti also left this observator}', and 

 Dr. M. Uda was transferred from the Government Fisheries Experimental 

 Station as a new Director. 



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