Abstract
SIGNIFICANT differences in variations of the Earth's magnetic field between 10 and 120 min long have been observed at sites in the west of Britain1. The hypothesis that these variations are due to a conducting channel in the mantle under Ushant Island, directed along the axis of the static anomalies in the magnetic field, was tested by measuring the magnetic field in different sites in the north of France and along the channel during 1968 and 1969.
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