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タイトル: 24. 短週期彈性波の實驗(其の1)
その他のタイトル: 24. Experiments with Elastic Waves in the Ground. I.
著者: 岸上, 冬彦
著者(別言語): Kishinouye, Fuyuhiko
発行日: 1942年6月30日
出版者: 東京帝国大学地震研究所
掲載誌情報: 東京帝国大学地震研究所彙報. 第20冊第2号, 1942.6.30, pp.284-290
抄録: Elastic waves were generated in the ground by rotating an eccentric mass driven by an electric motor, and the phase differences of the waves at two places observed with two geophones and a cathode ray oscillograph., The geophenes set at the two places were connected by means of electric cables to the horizontal and vertical deflection plates of the cathode ray oscillograph. The shape of the orbit of the cathode ray then changed with the phase difference of the waves at the two places. The orbit became straight lines when the geophones were set at intervals of half a wave-length, one wave-length, and so on. The wave lengths were measured from the distance of the geophones, and the period of the waves from the number of rotations of the motor per minute. The relations between the wavelength and the period, or velocity, of the waves, are shown in the figures in the paper. Numerous other experiments were made in order to investigate the nature of the was, but, as in the case of D A. Ramspeck and G. A. Schulze (see their waves,•paper (Veroff. Degebo., Berlin, Ht. 6 (1938)), scarcely any conclusive results were obtained.
URI: http://hdl.handle.net/2261/10571
ISSN: 00408972


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