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Magnetic shadows

Woodspring gradSearching for traces of disturbance in the soil, that is what the gradiometer is used for (apart from looking like you are carrying a Star Wars Tie Fighter in your hands!) It can detect the slightest differences in the magnetic field just beneath the surface, which may be due to different materials (stone rather than earth) or to the same material just being rearranged differently. So, I am back with magnetism, such a feature of the Portland project. The interesting thing about this way of using magnetism is that it can tell you where something happened but not what or when: almost like a shadow passing across the ground so slowly that we see it in one place, rather than in flux. Magnetic shadows cast by long-passed events. (Image: Bartington Instruments)

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