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タイトル: 比較觀測を目的とする水平動變位計の製作
その他のタイトル: A New Horizontal-Component Seismograph for Comparison Observations.
著者: 高橋, 龍太郎
平能, 金太郎
著者(別言語): TAKAHASI, Ryuttaro
HIRANO, Kintaro
発行日: 1941年9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19冊第3号, 1941.9.30, pp.527-533
抄録: A horizontal component seismograph of inverted pendulum type was newly designed. The main objects of this new design were ease of manipulation and great accuracy. To attain this object, all the jewels, by means of a flat spring, were made to press lightly against the pivots. This design was very effective in eliminating backlashes between the pivot and the jewels. As shown in Fig. 2, the helical spring and needle system that is so frequently used in connecting the magnifying levers was replaced in the new seismograph by a connecting rod, having pivots and plate springs at both ends. The air damper, which consists of a pendulum bob, which acts as the piston, and two cylinders covaring the both side of the bob, have a large functioing area, there beipg wide clearance between the piston and cylinder, making it easy to set up the instrument, and doing away with the contact of cylinder with the piston which is so liable to occur with rough manipulation, and bad observation conditions. The effective mass and the effective moment of inertia of the pendulum are 12・7kg and 1・18×104kg cm2 respectively. The geometrical magnification of the seismograph, that is, the magnification for an infinitely quick motion of the ground, is 47・5 and the period of free oscillation is 8・0 sec. The record is made on a sheet of smoked paper wound on a drum, 60 cm in circumference revolving once in 5 minutes. The drum is driven by a 6 watt Warren synchronous motor.
URI: http://hdl.handle.net/2261/10534
ISSN: 00408972


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