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| | USGS Earthquake Monitoring History (Site not responding. Last check: 2007-10-09) |
 | | This instrument was intended to give the direction, intensity, and duration of an earthquake, and was capable of responding to both horizontal and vertical motions. |
 | | Palmieri used it for many years on Mount Vesuvius and detected numerous shocks with the instrument (Palmieri, 1862a, 1862b, 1864, 1866, 1867, 1869, 1870, 1876). |
 | | One such seismoscope was among the seismographic equipment at Mount Hamilton, California, at the time of the California earthquake of April 18, 1906. |
| earthquake.usgs.gov /bytopic/eqmonitoring/history/part06.php (1919 words) |
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