68 EIGHTH PACIFIC SCIENCE CONGRESS 



He also made an electric recorder for sea wave pressure. The trans- 

 ducer of pressure gauge is of a variable mutual induction type using 

 about a 100 cycle/sec. constant audit frequency. The recording appara- 

 tus consists of six parts: a carrier wave oscillator, a modulator combined 

 with the pressure gauge, an amplifier and detector, an automatic cali- 

 brating suit, a direct inking oscillograph and an electrical power supply, 

 all kept in four portable cases. This apparatus can measure the wave 

 pressure from up to 50 ton/m^ with an accuracy of 2 to 3% in pres- 

 sure and 1/20 sec. in the period of pressure pulsation. Actual obser- 

 vations with this instrument proved successful. He made several im- 

 provements (OM, 1, 1949, 135-141; KK, 1, 1948, 2, 1949). 



Besides the wave recorder, Ishiguro devised an experimental analy- 

 sis method for the forced oscillation of water in a lake or sea. The 

 first method is to take movie pictures of the sea surface illuminated by 

 a nearly horizontal beam. He also replaced the oscillating water in 

 a basin by a combination system of electric impedance, the solution 

 being shown in a cathode oscillograph (KK, 4, 1950, 59-84). 



Ishiguro applied the techniques of photogrammetry in order to 

 measure the progressive phenomena on the sea surface such as tide 

 waves, and wind waves and swell (KK, 4, 1950, 35-39). 



He also devised a drawing instrument or graphic computer to ana- 

 lyze an irregular wave-form, or to combine different wave patterns, an 

 optical direction recorder for tidal currents and an electric-contact-type 

 speed recorder for submarine currents (KK, 4, 1950, 18-20, 21-23). Un- 

 fortunately these instruments have not yet been constructed because 

 of his illness. 



A nomograph diagram for the temperature correction of a non- 

 protected reversing thermometer is given by Y. Takenouti and T. Kato 

 (KH, 1, 1950, 53-56). 



The technique of determining the ocean currents by measuring 

 angle and direction of maximum inclination of the sounding wire was 

 studied by K. Fukutomi (CKH, 1, 1951). The relation between the 

 wind and the surface drift was discussed by K. Hishida (JOSJ, 6, 1950). 



In 1952 T. Abe made a different model of bathythermograph (KH, 

 2, 1952, 289-296). 



An undersea observation chamber "Kuroshio" was constructed in 

 Japan and operated by N. Inoue, T. Sasaki and R. Oaki. This in- 

 strument, very similar to the bathysphere vised by W. Beebe and Otis 

 Burton in the United States of America was constructed in 1951. This 

 project is financed by the Yomiuri Shinbun, one of the biggest news- 

 paper companies in Japan, the Japanese Government, and others. This 

 was used in the summers of 1951 and 1952 with success. (Journ. Scient. 



