/ saɪzməɡræf /
Množina reči seismograph je seismographs.
ETYM Greek seismos an earthquake + -graph.
An instrument for detecting and measuring the intensity and direction and duration of of movements of the ground (as an earthquake).
instrument for recording earthquakes.
Instrument used to record the activity of an earthquake. A heavy inert weight is suspended by a spring and attached to this is a pen that is in contact with paper on a rotating drum. During an earthquake the instrument frame and drum move, causing the pen to record a zigzag line on the paper; the pen does not move.