Tensor rings
Closed loops of twisted copper cut to a cubit length, the field said to stand in their centre, the older copper ring of Georges Lakhovsky, and what has been measured.
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The Copper Tensor Ring and the Field in the Middle of It
A copper tensor ring is a closed loop of twisted wire cut to a cubit length, made since 1991 in the line of Colorado blacksmith and dowser Slim Spurling, whose circle said a field stands in its centre. This is the ring, the readings reported for it, the older copper ring of Georges Lakhovsky, what John Wheeler's book says about a loop of wire, and the one number still unexplained.