Ferdinand Oberle hammers a metal stake
![Ferdinand Oberle hammers a metal stake](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/IMG_20180907_180450.jpg?itok=N3umL2ko)
Detailed Description
Ferdinand Oberle hammers a metal stake about a foot into the ground to anchor the ERT cable and provide a conductive connection between the cable and the subsurface. The scientists installed and removed stakes more than 1,200 times to collect ERT profiles.
Sources/Usage
Public Domain.