抄録
In the ordinary air damper used in a seismograph, the clearance between the moving piston and the outside cylinder is very narrow, causing no small difficulties for its adjustment. If the damper can be used with oil instead of air, a large damping can be obtained even with comparatively large clearance between the piston and the outside cylinder. In order to see whether or not, this attempt is practical, a series of experiment has been made.
To a pendulum which carries an oil filled piston damper, periodic forces were given and the response of the pendulum was measured.
It was found that the damper works quite satisfactorily, both in regard to the amplitude and phase relation.
