Geomagnetism Fredericksburg
By Geomagnetism Program
November 1930 (approx.)
![Adjustment of magnetic variometers at the old Cheltenham observatory by S. G. Townshend (left) and A. K. Ludy (right).](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/Fredericksburg-men.jpg?itok=7B9WsLyY)
Detailed Description
Adjustment of magnetic variometers at the old Cheltenham observatory by S. G. Townshend (left) and A. K. Ludy (right).
Sources/Usage
Public Domain.