seismograph has definitions from the field of physics
[ noun ] (physics) a measuring instrument for detecting and measuring the intensity and direction and duration of movements of the ground (as an earthquake)

Used in print

(L. Don Leet and Florence J. Leet, editors, The World of...)

This center also receives prompt reports on earthquakes from four Coast_Survey stations in the Pacific which are equipped with seismographs .

At 17_:_07 that afternoon ( Greenwich_time ) the shock was recorded by the seismograph alarm in Honolulu .

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