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Early electromagnetic seismometer

Early electromagnetic seismometer

V900/0058

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Credit

MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY

Caption

Early electromagnetic seismometer invented in 1856 by Luigi Palmieri. The device has mercury-filled tubes arranged along the points of the compass. During an earthquake, the movement of the mercury closed an electrical circuit. This stopped a clock and started a paper tape (upper right to bottom centre), which was marked with a pencil upon further movement of the mercury. The movement of a spring-mounted weight was also measured. Hence the time, duration, and intensity of an event were recorded. However, a true seismograph also records the waveform of the shock. Photographed in the museum at the Vesuvius Observatory, Naples, Italy, which Palmieri directed.

Release details

Model release not required. Property release not required.

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