Seismosensitive device

Details Seismosensitive device Seismosensitive device

1983-08-25

1985-01-08

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Signal transducers

Receivers

367188, 200 6147, 200220, 200222, 200229, 200234, H01H 2900

Patent

active

044930666

ABSTRACT:
A seismosensitive device comprises a hermetically sealed enclosure having a recess at the bottom, a first annular surface provided around the recess and having a radial gradient substantially of horizontal level and a second annular surface provided around the first annular surface and progressively diverging from the lower to upper portions with a slope having a gradient greater than that of the first annular surface. A switch assembly comprising a drop of mercury placed at the recess, an electrode bar provided with the enclosure, a needle contact secured to the electrode bar to have its lower end immersed into the drop is provided. When the mercury drop moves along the gradient surfaces significantly smoothly to separate from the needle contact upon tremor of the earth, the switch will open.

REFERENCES:
patent: 4066859 (1978-01-01), Steinmetz
patent: 4099040 (1978-07-01), Bitko

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