4 - Vicentini
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| Made in 1895 and 1899 in Padua (Italy). They were in use in Strasbourg until 1907. This is a complete system for recording the earth's movement: one seismometer to record two horizontal components, and another to record the vertical component:
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These simple machines are not very sensitive. They were intended to record strong movements from local earthquakes.
| The horizontal Vicentini is made of an elementary pendulum: a mass of 100kg (220lb) at one end of a rod. The horizontal oscillation of the mass is decomposed into two movements directed North-South and East-West respectively. They are undamped. The recording system has unfortunately been lost. It was located under the mass and gave a helicoidal recording of the two horizontal components and of one component to mark the time. This was on carbon-covered paper. At the end of the last century, two tendencies developed simultaneously: seismographs of small masses, notably in the work of Von Reuber-Paschwitz, which involves an optical recording without friction, and in Italy different models of seismographs, where the stationary mass plays an important role and allows for mechanical recordings. |
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