Hugo Benioff with fused-quartz extensometer
- Hugo Benioff with fused-quartz extensometer
- Caltech Photographs
- Photographs of Academic Divisions and Departments
- 1 photographs (negative)
- 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.