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タイトル: 15. 移動觀測用水平動微動計
その他のタイトル: 15. A Portable Horizontal Tromometer
著者: 岸上, 冬彦
著者(別言語): Kishinouye, Fuyuhiko
発行日: 1942年3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1号, 1942.3.30, pp.215-219
抄録: This tromometer constructed with the object of observing with it microseisms of 4sec period at three or more places simultaneously in order to enable investigation into the nature of microseisms. It consists of a horizontal pendulum, suspended with two flat springs, and an optical recording device. The pendulum bob weighs 1550g, the length of the pendulum arm being 20cm. A copper plate, attached to the end of the pendulum, which swings the poles of an MK magnet, serves as an electromagnetic damper. In order to avoid the resonance of the pendulum to microseisms of 4 sec period, the period of free vibration of the pendulum can be made to exceed ten seconds. The geometrical magnification is about 400 when lens of 50cm focal length is used in the optical recording system, and about 800 when the focal length is 100cm. For recording, in place of the recording drum, a sheet of bromide paper, about 56×11.5cm, is wound directly round two wheels which are fixed on an axis of rotation, the rate of rotation being once in ten minutes, the driving power being an AC 100V synchronous motor. The pendulum and the recording apparatus are placed each in a separate wooden box. The sizes of the two boxes are 58×33×27cm and 42×22×25cm and their weights 7 and 4.5kg. respectively.
URI: http://hdl.handle.net/2261/10562
ISSN: 00408972


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