Ewing duplex pendulum seismoscope
1979
- Title
- Ewing duplex pendulum seismoscope
- Collection
- Caltech Images Collection
- Series
- Academic Divisions and Departments
- Sub-Series
- Physics
- Identifier
- 10.50-24
- Dates
- 1979
- Extents
- 1 photographs
- Abstract
- Rebuilt at Caltech ca 1979. This instrument recorded the 1906 San Francisco earthquake in Carson City, NV. It was manufactured in 1887 at Paul Seiler’s electrical works in San Francisco. Source: Paul C. Jennings and Hiroo Kanamori, “Determination of Local Magnitude, ML, from Seismoscope Records,” B Seismol Soc Am 69/4 (1979), 1267-1288; Figure 9, p. 1284.