Unidirectional horizontal seismometer

Details Unidirectional horizontal seismometer Unidirectional horizontal seismometer

1977-05-31

1978-08-15

Wilbur, Maynard R.

Communications: electrical

Selective

Interrogation response

73653, 73665, 181122, G01V 116

Patent

active

041076435

ABSTRACT:
A fluid film levitated horizontally oriented disc is self-centering and floating above another similar mating surface stationary disc. A means for varying the natural period of free oscillation of the levitated disc within the normal earthquake band of frequencies and a means for damping out such free oscillations along with a means for transducing positional differences between the discs into signals wherein earth tremors arriving from any horizontal direction may be recorded.

REFERENCES:
patent: 2581063 (1952-01-01), Alexander
patent: 3026428 (1962-03-01), French
patent: 3164983 (1965-01-01), Perkins, Jr. et al.
patent: 3555886 (1971-01-01), Thornton
patent: 3709030 (1973-01-01), Aselman, Jr.

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