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Earthquake indicator

  • US 4,484,186 A
  • Filed: 11/20/1981
  • Issued: 11/20/1984
  • Est. Priority Date: 11/20/1981
  • Status: Expired due to Fees
First Claim
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1. An earthquake indicator, comprising in combination, a circular base, an inverted U-shaped frame affixed on said base, a circular ring supported by strips underneath said frame, and a depending rod from said frame, passing through said ring, said rod and ring comprising contacts of a switch in a warning electric circuit, a plurality of circles marked upon said base defining earthquake intensities, and means to adjust said indicator.

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