Earthquake indicator

Details Earthquake indicator Earthquake indicator

1981-11-20

1984-11-20

Trafton, David L.

Communications: electrical

Condition responsive indicating system

Specific condition

33391, 33402, 73652, 116303, 200 6152, 340690, G08B 2100

Patent

active

044841868

ABSTRACT:
A novelty for apparently indicating earthquakes, including a circular base marked with concentric circles on its upper side defining different earthquake intensities, a frame upon the base supporting a freely depending electrical contact through a supported circular contact so that in case the device is tilted, the contacts touch and thus close a circuit to a warning alarm.

REFERENCES:
patent: 2344014 (1944-03-01), Allison
patent: 2486697 (1949-11-01), White
patent: 3597753 (1971-08-01), Tabankin
patent: 4297690 (1981-10-01), Baker

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