An experimental device has been developed which exhibits the characteristics of a vertical seismometer with a long natural period, the experimental device having demonstrated periods to 20 seconds. The device achieves long-period seismometer action through magnetic field support of the mass and electronic feedback. With suitable device parameters the performance equations will be of the same form as those of a conventional inertial seismometer, the natural period and damping being functions of an amplifier gain. There are other possible uses of the device principles, one being the construction of a stable table.
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H. E. Sheffield (1964) studied this question.