Earthquake recording device

Details Earthquake recording device Earthquake recording device

1977-09-23

1978-09-26

Miller, Jr., George H.

Recorders

Record tracer movement responsive to inertia or mass...

346 44, 346112, 340 17, G01D 904, G01D 1516, G01V 116

Patent

active

041174968

ABSTRACT:
An earthquake recording device in which magnetically damped compound pendulums support smoked glass lenses. The natural frequencies of the pendulums are different. The points of stylus arms rests upon the smoked glass lenses and trace the pattern of movement produced by earthquake shocks on the lens surfaces. A timing device lifts the stylus arms periodically so that a time scale is provided on the tracing on the smoked glass.

REFERENCES:
patent: 2959459 (1960-11-01), Ryan
patent: 3183512 (1965-05-01), Castle
patent: 3795006 (1974-02-01), Engdahl et al.
patent: 3974504 (1976-08-01), Engdahl

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