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).

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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.