It consists of a circular frame made from non- magnetic silver aluminum alloy. An insulating copper wire is wound on the frame. The ends of the wires are connected to the terminals which are fitted on the superior quality wooden board. A rectangular frame is supported on wooden board. The anodized aluminum rods are graduated up to 50 cm on both sides. Superior quality permanent magnet compass box moves on a platform. This platform moves on the rectangular frame along the axis of the coil. Supplied with a superior quality compass box.

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