Seismic movement detector responsive in both vertical and horizo

Details Seismic movement detector responsive in both vertical and horizo Seismic movement detector responsive in both vertical and horizo

1980-04-01

1982-11-09

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340601, 340690, G08B 2100

Patent

active

043587577

ABSTRACT:
A device for signalling seismic movements or the like, comprising a first pair of electric contacts, one of said contacts being vibratile relatively to a horizontal rest position and the other contact of said pair being adjustably spaceable from said rest position; a second pair of electric contacts, one of the contacts being vibratile relatively to a generally vertical rest position and the other contact of said pair being adjustably spaceable from said rest position; an electric circuit connected to said two pairs of contacts and being closed when the vibratile contact of at least one of said pairs contacts its corresponding adjustable contact, at least one warning unit being inserted into said circuit to emit warning signals when said circuit is being closed.

REFERENCES:
patent: 893997 (1908-07-01), Haas et al.
patent: 1650968 (1927-11-01), Tedeschi

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