Title: Hugo Benioff with fused-quartz extensometer
Date: 1957 (approximate)
Original Format: photograph: negative
Description: This instrument was designed to measure the tidal strains of the earth produced by the gravitational action of the sun and moon. It also could record ultra-long seismic waves and the possible free oscillation of the earth. This photo is probably taken at an installation in Santiago, Chile. See Engineering & Science, October 1957.
Collection: Photograph Collection
Series/File: Academic Divisions
Caltech Archives ID: 10.50-1