The gradiometer is comprised of two magnetometers separated from each other in a rigid framework, and in this picture, it is about to be deployed. Archaeologists soon discovered one of the instruments did not work.
Gradiometer
Image courtesy of NOAA/ONMS/Brad Barr. Download larger version (jpg, 1.9 MB).

The gradiometer is comprised of two magnetometers separated from each other in a rigid framework, and in this picture, it is about to be deployed. Archaeologists soon discovered one of the instruments did not work.

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