Brasart seismoscope, 1884.
2 9 c m
actual image size: 32cm x 21cm

Brasart seismoscope, 1884.

© Science Museum / Science & Society Picture Library


This seismoscope, made by Brasart, was installed at a number of observatories round Mount Etna in Sicily, Italy. A ball-and-rod arrangement indicated the direction of horizontal shock waves, the spring stretched with vertical vibration into a cup of mercury. Either action started the clock and rang the bell.

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