
2 9 c m
40cm
actual image size: 32cm x 21cm
Description
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.
Image Details
Image Ref.
10284334
© Science Museum / Science & Society Picture Library