March 1 3:05 AM, March 27 3:30 A.M, April 26 3:04 A.M. May 5 3:03 A.M. by the Japanese Standard Time. (The accuracy is +5 min.) The next evidence is the anorcalous vibration of the surface of sea, The tidal indicator of the observation points on the Pacific coast detected the tidal waves ceused by the explosion of hydrogen bomb. This wave arrived at the Japanese coast about one hour end a half later than the anomalous atmospheric oscillation. (See Fig. 2). Radioactivity in the Atmosphere -- Thirdly, the radioactivity is observed in the air as well as in the raimater. Mr. T. Shiokewa of Shizuoka University have teen ceasSuring the radioactivity of the ash which is obtained by burning a veseline-coated paper (30cm30cm) exposed to the air on the roof. He observed a radioectivity of 750 cpm from a paper which was exposed outdoors from tay 13 to May 16. Weanwhile, at Kagoshima, Mr. KM. Kanata of “Kagoshima University observed a radioactivity of 4000 cpm/l in the rain of May ly, Then Mr. T. Shidei of Kyoto University observed on May 16 a strik- ing amount of redicactivity (86,000 cpm/1) in the rain. Thereafter the rain began to show strong radioactive contemination at many pleces on the Facific ccest. Judging from the data obteined by the barozmeters and the tidel indicetors, the explosion on May 5 is the cne closest to the middle of Msy when the racicactive rain tegen to fell over Japen. This is just the beginning of tisigu" (reins sesson) of this year. If one studies the rotion of the eir ness at this sARes one will find that the air mass around Bikini goes round the rim of the zone of high aimespheric pressure in the north Facific, arrives at southern JaDan threugh Prilippines and Formosa, am forms the "tsuyul" front line to pour the rein there, Since it takes an a week for the elr mess to iravel from Bitdcni te Japan, it will De around Vey 135 or lL inat the redicactive subsiences rrofaced by the Mey & renicsicn arrives ai Jecen. (Fig. 3). The meesurenent of the helflife et that tine also irdicetes that the explesion took Furtnermre, place about 7 or & days ego. it was clearly shown that the redicectivity in the rein, since Vay, nec teen stronger on the Pecific coast than on the Jépan See side by an crcer cf ragmitude. eee th ei Cina Ere ° nets Gice Veet Meets pro jw