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.
IIIF Manifest