JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Seismograph. Device that detects and records movement of the ground due to earthquakes (seismic activity). A regular pulse at 30 second intervals, as seen, enables any seismic events to be timed. This type of machinery has now been superseded by computer screen displays. Photographed at the Keyworth site of the British Geological Survey.
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