2 Free Images of World Wide Standardized Seismograph Network

seismometercc-zerofiles uploaded by daderotscientific equipment in the national museum of american history
Seismometer (horizontal), made for the World Wide Standard Seismological Network by Spregnether Instrument Company, St. Louis, MO, 1961-1962 - National Museum of American History - DSC00020
self-published workseismometer
Seismometer (vertical), made for the World Wide Standard Seismological Network by Spregnether Instrument Company, St. Louis, MO, 1961-1962 - National Museum of American History - DSC00023
self-published workseismometer
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